Medicine

HYGIENIC FUNDAMENTALS OF GOOD NUTRITION

Hygienic fundamentals of good nutrition. Determine whether the food with calorie and nutrition faculty. Food poisoning and their prevention.

Nutrition 

Nutrition may be defined as the science of food and its relationship to health. It is concerned primarily with the part played by nutrients in body growth, development and maintenance. The word nutrient or "food factor" is used for specific dietary constituents such as proteins, vitamins and minerals. Dietetics is  the practical application of the principles of nutrition; it includes   the planning of meals for the well and the sick. Good nutrition means "maintaining a nutritional status that enables us to grow well and enjoy good health". Maintaining a healthy diet is the practice of making choices about what to eat with the intent of improving or maintaining good health. Usually this involves consuming necessary nutrients by eating the appropriate amounts from all of the food groups. Since human nutrition is complex a healthy diet may vary widely subject to an individual's genetic makeup, environment, and health. For around 20% of the planet's population, lack of food and malnutrition are the main impediments to healthy eating.

http://en.wikipedia.org/wiki/Nutrition

Generally, a healthy diet will include:

1. Sufficient calories to maintain a person's metabolic and activity needs, but not so excessive as to result in fat storage greater than roughly 12% of body mass;

2. Sufficient fat, consisting mostly of mono- and polyunsaturated fats (avoiding saturated and "trans" fats) and with a balance of omega-6 and long-chain omega-3 lipids;

3. Sufficient essential amino acids ("complete protein") to provide cellular replenishment and transport proteins;

4. Essential micronutrients such as vitamins and certain minerals.

5. Avoiding directly poisonous (e.g. heavy metals) and carcinogenic (e.g. benzene) substances;

6. Avoiding foods contaminated by human pathogens (e.g. e. coli, tapeworm eggs);

7. Avoiding chronic high doses of certain foods that are benign or beneficial in small or occasional doses, such as

  • foods or substances with directly toxic properties at high chronic doses (e.g. ethyl alcohol, Vitamin A);
  • foods that may interfere at high doses with other body processes (e.g. table salt);

  • foods that may burden or exhaust normal functions (e.g. refined carbohydrates without adequate dietary fiber).

http://www.healthyliving.gov.uk/publications/pub_fulldoc.cfm?TxtTCode=1495

The Food Guide Pyramid

Good nutrition is important for everyone.

http://www.nutrition.com.sg/he/hepyr.asp

The Food Guide Pyramid lists a range for number of servings in each of five food groups based on age, sex, and level of activity. Serving sizes are also specifically defined. Use the pyramid as an outline of what to eat each day.

 

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The small tip of the pyramid includes tats, oils, and sweets. These are foods such as salad dressing and cooking oils, butter and margarine, sugar, soft drinks, candy, and most dessert foods. Foods in this section of the pyramid provide calories but have very little nutritional value. Use them sparingly. The next level of the pyramid contains two food groups that are predominantly animal products. Included in this section are milk, yogurt, cheese, meat, poultry, fish, dry beans, eggs, nuts, and nut butters. These roods are important for the protein, calcium, iron, and zinc they contribute to your diet. Choose skim or low-fat dairy products whenever possible, Select lean cuts of meat and poultry without skin and prepare them without added tat Wits, seeds, and nut butters are high in fat, so eat them in moderation. Vegetarians must to pay particular1 attention to eating a wide variety of non-animal protein foods to ensure a healthful diet.

The third level or the pyramid includes fruits and vegetables. Most people need to eat more of these foods for the abundance of vitamins, minerals, and fiber they supply. Plain varieties of frozen fruits and vegetables offer nutrition similar to that of fresh produce. Avoid canned or frozen fruits in heavy syrups or vegetables in cream sauce unless you can afford the extra fat and calories they provide.

The base of the pyramid includes breads, cereals, rice, and pasta – all foods from the grain group. You should eat more servings from the grain group than any other level of the pyramid. These nutrient-rich foods provide complex carbohydrates, vitamins, minerals, and fiber. Choose at least several servings each day of whole-grain breads and cereals. Remember that starchy foods aren't fattening - unless you top them with butter, cream, cheese, or rich sauces and gravies.

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Main rules of healthy nutritional

·        Eating fruits, vegetables, and grain products that contain fiber may help prevent heart disease

·        Limiting the amount of saturated fat and cholesterol in your diet may reduce your risk of heart disease

·        Limiting the amount of total fat you eat may help reduce your risk for cancer

·        Eating fiber-containing grain products, fruits, and vegetables may help prevent cancer

·        Eating fruits and vegetables that are "low in fat" and "good sources" of dietary fiber, vitamin A, or vitamin C may help prevent cancer

http://www.illumine.co.uk/course-fit-healthy-nutrition.htm

CLASSIFICATION OF FOODS

There are many ways of classifying foods:

1. Classification by predominant functions:

(1)Energy-giving foods. These constitute fats and carbohydrates. They are also called protein sparers. Proteins also produce energy to some extent. Cereals, roots and tubers, dried fruits, sugars and fats belong to this group. They supply heat and energy to the body.

(2)Body building foods. These are foods rich in proteins, mineral salts and water. Milk, meat, fish, pulses, oilseeds and nuts fall in this category.

(3)Protective foods. These constitute inorganic salts, vitamins and minerals. They include proteins and water. Milk, eggs, liver, green leafy vegetables and fruits are included in this group. They build our bones, teeth, muscles, soft tissues, blood and other body fluids. They provide material for repair in the body as wear and tear goes on constant-

2. Classification by origin:

1)         Foods of animal origin

2)         Foods of vegetable origin

3. Classification by chemical composition:

1)         Proteins

2)         Fats

3)         Carbohydrates

4)         Vitamins

5)         Minerals

4. Classification by nutritive value:

1)         Cereals and millets

2)         Pulses (legumes)

3)         Vegetables

4)         Nuts and oilseeds

5)         Fruits

6)         Animal foods

7)         Fats and oils

8)         Sugar and jaggery

9)         Condiments and spices

10)    Miscellaneous foods

http://www.illumine.co.uk/course-fit-healthy-nutrition.htm

Achieving a healthy diet is popularly misperceived as being attainable by eating 'healthy foods'. Many people[ falsely believe that there are 'good' and 'bad' foods; they develop bad diets because they think that abundant eating of foods they consider 'healthy' will create a healthy diet. However, this is far from the truth.

The consumption of nothing but substances that are deemed healthy, such as an "all-grain diet" or a diet consisting only of pasta or other health-foods, would most likely result in deficiencies because important nutrients (like protein-based foods) would be missed. Foods such as grains, fish, corn, etc. are healthy when consumed with a balanced diet, because in combination they supply us with all of the required nutrients. The most important aspect of any diet is maintaining a healthy intake and balance of foods.

The balance of micronutrients gained from meat, vegetables, and other foods is what makes diets healthy, not only consuming 'healthy' foods. For instance, milk, cheese, and other dairy products are known to have a relatively high fat content. Removing such dairy products from a diet may lower fat ingestion, but it will also negatively affect the intake of calcium and riboflavin that such foods offer.

Governmental guidance

Although a healthy diet is based upon nutrition, people eat foods and not nutrients; as few people know which foods supply which nutrients, allowing people to self-regulate their diets means that they run the obvious risk of deficiency. Due to past difficulties of educating people about nutrient intake, governments have opted to counsel on what foods to eat rather than on what nutrients to ingest.

Most states set guidelines for a healthy diet -- these usually vary slightly from country to country based upon demographics. These guidelines do however usually share the same recommendations of eating less fried or fatty foods to reduce cholesterol. Many guidelines suggest replacing certain foods with healthier alternatives that supply an abundance of nutrients, for instance using legumes or beans within a salad or pasta.

As BMI and weight changes from person to person, the general Reference Nutrient Intakes (RNI) set by governmental institutions may be somewhat lacking for some people, despite the fact that the RNI is generally calculated as higher than the average nutrient intake. It is even thought that some people may have needs above that of the RNI, meaning even if a person achieved nutrient intake, they would still not be fulfilling the RNI. The only real way to know the RNI for a person is to implicitly monitor the intake of nutrients and amount of exercise.

Detrimental eating habits

In specific individuals, ingesting foods containing natural allergens (e.g. peanuts, shellfood) or drug-induced triggers (e.g. tyramine for a person taking an MAO inhibitor) may be life-threatening.

Some foods have low nutritional value, and if consumed on a regular basis will contribute to the decline of human health. This has been demonstrated by various epidemiological studies that have determined that foods such as processed and fast foods are linked to diabetes and various heart problems.

When improperly cut or prepared, a small number of foods (such as fugu) can result in death.

The ingredient usually cited as being most crucial to good health, water, has even been known to result in death when consumed in extraordinary quantities.

From a psychological perspective, a new healthy diet may be difficult to achieve for a person with poor eating habits. This may be due to tastes acquired in early adolescence and preferences for fatty foods. It may be easier for such a person to transition to a healthy diet if treats such as chocolate are allowed; sweets may act as mood stabilizers, which could help reinforce correct nutrient intake.

It is known that the experiences we have in childhood relating to consumption of food affect our perspective on food consumption in later life. From this, we are able to determine ourselves our limits of how much we will eat, as well as foods we will not eat - which can develop into eating disorders, such as anorexia or bulimia nervosa. This is also true with how we perceive the sizes of the meals or amounts of food we consume daily; people have different interpretations of small and large meals based on upbringing.

While plants, vegetables, and fruits are known to help reduce the incidence of chronic disease, the benefits on health posed by plant-based foods, as well as the percentage of which a diet needs to be plant based in order to have health benefits is unknown. Nevertheless, plant-based food diets in society and between nutritionist circles are linked to health and longevity, as well as contributing to lowering cholesterol, weight loss, and in some cases, stress reduction.

Indeed, ideas of what counts as "healthy eating" have varied in different times and places, according to scientific advances in the field of nutrition, cultural fashions, religious proscriptions, or personal considerations.

The basis of all vital processes of an organism of the man is a constant metabolism between an organism and environment. From an environment the man consumes oxygen, water and food-stuff. The role of nutrition consists in updating energy and fabric elements necessary for correct body growth, developments and functioning of an organism, for maintenance of metabolic processes, normal condition of health and working capacity. The full value of a diet of the people is the important factor, which determines their condition of health, influence on body growth and physical development, working capacity, adaptation opportunity, morbidity and life duration. Just due to the nutrition the continuity of a course of two opposite and mutually connected processes of assimilation and dissimilation is provided.

Kinds of food. In various historical times structure of nutrition and character of a nutrition changed depending on development of industrial forces of a society, climate-geographical conditions, direction of economic activity and so on. The character of nutrition of the population was formed gradually depending on an economic and cultural level of development of the country, in view of national customs and features.

Changing concepts

Through centuries, food has been recognized as important for human beings in health and disease. The history of man has been to a large extent struggle to obtain food.  Until the turn of the 19th century the science of nutrition had a limited range. Protein, carbohydrate andfat had been recognized early in the 19th century as energy-yielding foods and much    attention were paid to their metabolism and contribution to energy requirements. The discovery of vitamins at the turn of the 20th century “rediscovered" the   science of nutrition. Between the two World Wars, research on protein gained   momentum. By about 1950, all the vitamins and essential amino acids had   been discovered. Nutrition gained recognition as a scientific discipline, with roots in physiology and biochemistry. In fact nutrition was regarded as a branch of physiology.

Great advances have been made during the past 50 years in knowledge of nutrition and in the practical application that knowledge.   Specific   nutritional diseases were identified and technologies developed to control them, as for example, protein energy malnutrition, endemic goitre, nutritional anaemia, nutritional blindness and diarrhoeal diseases.

RELATION OF NUTRITION TO HEALTH

http://www.nutrition.com.sg/he/hepyr.asp

Good nutrition is a basic component of health. The relation of nutrition to health may be seen from the following view points:

Growth and development: Good nutrition is essential for the attainment of normal growth and development. Not only physical growth and development, but also the intellectual development, learning and behaviour are affected by malnutrition. Malnutrition during pregnancy may affect the foetus resulting in still-birth, premature birth and "small-for dates" babies. Malnutrition during early childhood delays physical and   mental growth; such children are slow in passing their "milestones", and are slow learners in school. Good nutrition is also essential in adult life for the maintenance of optimum health and efficiency. In short, nutrition affects human health from birth till death.

Specific deficiency: Malnutrition is directly responsible for certain specific nutritional deficiency diseases. The commonly reported ones in India are kwashiorkor, marasmus, blindness due to vitamin A deficiency, anaemia, beriberi, goitre, etc. Good nutrition therefore   is essential for the prevention of specific nutritional deficiency diseases and promotion of health.

     Resistance to infection:

Malnutrition predisposes to infections like tuberculosis. It also influences the course and out-come of many a clinical disorder. Infection, in turn, may aggravate malnutrition by affecting the food intake, absorption and metabolism.

Mortality and morbidity:

The indirect effects of malnutrition on the community are even more striking - a high general death rate, high infant mortality rate, high sickness rate and a lower Expectation of life. Over-nutrition, which is another form of malnutrition is responsible for obesity, diabetes, hypertension, cardiovascular and renal disease, disorders of the liver and gall bladder. More recent reports suggest that diet perhaps plays an important role in certain types of gastro-intestinal cancers. It is now quite well accepted that diet and certain diseases are interrelated.

   Nutrition as a science can be regarded as the study of six main categories of food components: protein, carbohydrate, fat, minerals, vitamins, and water. The first three categories -protein, carbohydrate, and fat — are the only ones that provide calories. Protein provides 4 Calories/gm, as doe’s carbohydrate. Fat provides slightly more than twice as much — 9 Calories/gm.

 www.Vitamins and minerals.htm

Although minerals and vitamins provide no calories, they function in the many metabolic processes whereby one obtains and utilizes energy from foods and builds and then maintains body tissues. Minerals also function as vital constituents of many body tissues. Iron is a necessary component of hemo­globin, myoglobin, and the cytochromes, and calcium and fluoride are required for sound teeth and bones.

The Water.  It is an important constituent of food and in its absence, it is impossible to survive beyond a few days. It forms about 70% of body weight. Even bones contain about 20% of water. Water is necessary to make up the loss caused by its excretion in breath, sweat, urine, faeces, and also to renew all the various fluids and solid organs of the body.

 The amount of water needed by every individual generally varies depending upon the outside temperature or the extent up to which the human body is subjected to the manual labour. This rise of temperature and humidity of air increases the necessity for intake of water. An insufficient intake of water leads to creation of disturbance in circulation, of heat regulation mechanism and the retention of products of metabolism. On the other hand, abundant intake of drinking water promotes  the circulation of fluid and increases the activity of kidneys with free secretion of urine. It is estimated that about 80 oz (2.27 litres) of water enters the body daily as such or as a part of cooked food, beverages etc. Out of which 48-64 oz. (1.37- 1.81 litres) is excreted daily in urine, sweat etc.

Some important uses of water are:

- As a solvent for transportation of nutrients in the body.

- It   helps   regulating   body   temperature through evaporation from lungs and skin.

- As an aid in removing wastes of metabolism in the urine.

- As an aid in functions like osmosis.

 It is possible to allocate five groups of diseases, that is direct or mediate related with a nutrition:

1. Alimentary disease, illness caused by deficiency or surplus of components of nutrition.

2. The secondary illnesses of insufficiency or excessive nutrition, which is developed as complication on a background of wearisome illnesses (surgical, infectious, oncology and others.)

3. Disease of multifactor nature that very much frequently develops on a background of genetic predilection, for example, atherosclerosis, gout, idiopathic hypertensia, oncological diseases etc.  

4. Disease, which are transferred by a nutritional way (some infections and helminths, alimentary poisonings).

5. Alimentary intolerance - atypical reaction to nutrition, for example alimentary allergy, idiosyncrasy.  Fats.

FUNCTIONS OF FOOD:

The main functions of food are:-       

1. Provision of energy - It provides fhe body fuels or energy foods, which on oxidation supply heat and energy. Even while at bed rest, some energy is being expended on respiratory, circulatory, and other body processes.

2. Body building and repair - It provides the material needed for growth  and upkeep of the body. Even after growth isstopped, the body continues to change throughout life. Tissues are continually wearing out and these must be changed or repaired.

3. Maintenance and regulation of tissue functions - It provides the materials which regulate and maintain body functions and processes. They regulate the way, in which various parts of the body act and protect the body from disease

On the basis of the above functions foods have been classified as :

(1) Energy-yielding foods: These are foods rich in carbohydrate and fat, e.g., rice, wheat, potatoes, sugar, fats and oils.

(2) Body building foods: These are foods rich in protein, e.g., milk, eggs, meat, liver, fish, pulses, oilseed cakes.

(3) Protective foods: These are foods rich in vitamins, minerals and proteins, e.g., milk, green leafy vegetables. Protective foods are so called because they protect the body against infection, disease and ill health.

A balanced diet must contain foods from the above three groups.

Balanced diet is one, which will meet a person's caloric need and contain all nutrients, particularly proteins, and vitamins. In addition, the food should satisfy the taste and desire of a person and should have enough roughage to promote the peristalsis. Balanced diet should have 50-60 % carbohydrates 30-35 % fats and 10-15 % proteins with necessary vitamins and minerals.

1. Conformity of entering energy to energy losses.

2. Conformity of chemical structure of alimentary substances to physiological needs of an organism.

3. The maximal variety of a ration.

4. Keeping of an optimum regimen of nutrition.

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NUTRIENTS

Nutrients are organic and inorganic complexes contained in food. There are about 50 different nutrients which are normally supplied through the foods we eat. Each nutrient has specific functions in the body. Most natural foods contain more than one nutrient. These may be divided into :

(i) Macronutrients: These are proteins, fats and carbohydrates which are   often   called   "proximate   principles" because they form the main bulk of food.

 (ii) Micronutrients : These are vitamins and minerals. They are called micronutrients because they are required in small amounts which may vary from a fraction of a milligram to several grams.

A short review of basic facts about these nutrients is given below.

Animal Foods

These are, for example, e.g. meat, fish, eggs milk and milk products.

Meat

Characteristics of Good Meat

1. It has marbelled appearance due to fat and is acidic.

2. It is firm and elastic to touch.

3. No oedema or bad odour.

4. It is dry on surface and does not shrink much on cooking.

Meat of Unsound Quality

1. It is soft, moist and pale.

2. Reaction is alkaline and has putrefied odour.

Following are some of the diseases produced by consumption of unsound meat.

1. Tuberculosis: Tuberculosis is common in cattle but rare in sheep and goats. Usually, lymphatic glands, lungs, and liver are affected, but not the muscles. Howevr, flesh of tubercular animal should always be condemned.

2. Food poisoning may be caused by tinned meat. Such tins should have no dents and their ends should be concave and not convex. On opening, air should rush out and contents should not be discoloured.

3. Cysticercosis: Embryos of tape-worms inhabit the muscle of pigs, ox, etc and such a meat when ingested causes tape worm infection. However, embryos are killed, if such a meat is properly cooked.

4. Trichenella spiralis: Embryos are usually encysted in pig meat.

5. Actinomycosis through ox-meat especially in damp climate. The affected portions should be condemned.

6. Liver flukes is common in liver of sheep. Cooking always kills the parasites.

Preventive Measures

1. Compulsory inspection of animals before slaughtering and also of carcasses by veterinary experts at slaughter houses, which should be public owned.

2. The slaughter houses should be pucca built with proper drainage and free water supply for cleaning. These should be situated away from habitation and no dogs, etc. should be allowed in the vicinity.

3. Persons suffering from infectious diseases should not be al­lowed to handle meat.

4. Meat at shops must be properly protected from flies.

5. Vehicles for transporting meat must be clean.

Fish

It is highly nutritive and easily digested. It contains all vitamins (except Vit. C) and has high calcium value. Its liver is rich in Vit. A and D. Fresh fish has bright pink gills and firm shiny scales with prominent eyes. It is firm and elastic with no bad odour.

Fish is considered as 'brain food'. It contains omegas, a polyun-saturated fatty acid, which lowers blood pressure, relieves arthritis inflammation and aids brain development. Fish oils tend to lower blood cholesterol and triglycerides.

Fish poisoning may occur by toxin produced by Cl. botulinum and decomposed fish may cause protamine poisoning. Shell fish from polluted water contains toxins.

Eggs

An average hen's egg weighs about 60 Gm, with 2/3rd as white and 1/3 as yolk. It has all the important nutrients except carbohydrates. The egg white is mostly egg albumin; while the yolk contains fat, lecithin, phosphorus, calcium and iron. The egg can be preserved by making their shells air tight by immersing them in lime-water or by coating them with oil or sodium silicate a process of glazing. The test for freshness of an egg: put it in 10% common salt solution; good eggs sink while stale ones will float.

Milk

It is an ideal food containing nearly all the nutrients of well balanced diet. It is the best particularly for infants, children, and lactating mothers. It contains milk sugar (Lactose), proteins, fat, vitamins, clacium pJzosphorus, chloride, potassium and sodium but is poor in iron.

Composition of Milk

Source of      Milk        Proteins     Fats      Lactose    Minerals     Water

Human                               2.4        3.1        6.2       0.8                     88.0

 Cow                                  3.5        3.7       4.8        0.7                    87.3

 Goat                                 3.6       4.6       42       0.7                         86.9

Buffalo                             4.8        7.8       45       0.8                       82.1

In proteins, there is more of caseinogen in cow's and buffalo's milk; while there is more of lactalbumin in human and goat's milk. Fat contents in human and cow's milk are nearly the same, while in goat's and buffallo's milk they are more.

http://www.kidshealth.org/

Influence of Milk Products on the Organism

Name of the product

General influence on the organism

Specific influence on the organism

Indications for prescription

Contraindications

1. Sour milk

Stimulates appetitis, influences on the secretory and motoric function of intestine

Lactic acid improves development of useful microflora in the intestine

Rational nutrition of all population groups

Ulcer disease of stomach and duodenum with increased acidity

2. Kefir

Stimulates appetitis, influences on the secretory and motoric function of intestine

Improves development of useful microflora in the intestine

Rational  nutrition of all population groups

The same as previous

2.1. Greasy kefir

The same

The same

Diabetes mellitus

The same

2.2. Ungreasy kefir

The same

The same

Obesity, diseases of cardiovascular system, liver

The same

2.3. Light kefir (1-day)

The same

Laxative

Constipation, spastic colitis

The same

2.4. Middle kefir (2-day)

The same

The same

Rational nutrition

The same

2.5. Strong kefir (3-day)

The same

Antiputrid, strenthening

Gastritis with decreased acidity, chronic colitis, diarrhea

The same

3. Koumiss

Albuminous milk is well digested in the organism (part of proteins transforms to albumases and peptons), stimulates appetitis

Stimulates gastric secretion, activates peristalsis of intestine, decreases putrid processes in intestine, eliminates mycobacterium tuberculosis, decreases intoxication

Tuberculosis, decreased acidity of gastric juice, intoxication, exhausting, anemia

Non

3.1. Light koumiss

The same

Laxative

Constipation

Non

4,5,6. Acidofilic products (acidofilin, acidofilic milk, acidofilic yeast milk)

Stimulate appetitis, influence on the secretory and motoric function of stomach and intestine

Have considerable bactericidal properties, slow putrid processes in intestine

Enterocolitis, disenteria, tuberculosis, dysbacteriosis, constipation, exhausting, ray disease

Ulcer disease with increased secretion, gastritis, pancreatitis

7. Yoghurt.

Stimulates appetitis, influences on the secretory and motoric function of the intestine

Middle bacteriostatic properties, slow putrid processes in the intestine

Rational nutrition of all population groups, children’s nutrition, prophylaxis of dysbacteriosis

The same

8. Sour cheese (greasy, middle, ungreasy)

Partially fills the organism needs in proteins, essential aminoacids, well digested calcium, grow and lipotropic substances. Especially it is important for women, children, old people

Due to presence of metionin, choline and lecitin has considerable lipotropic properties.

Rational nutirtion, children’s nutrition, acute and chronic hepatitis, cholecystitis, ischemic heart disease, obesity, diabetes mellitus, exhausting, osteoporosis, fractures

Phosphaturia

 

Methods of Preservation of Milk

1. Boiling is very common method in India. It is quite simple and satisfactory as all pathogens are killed.

2. Sterilizationby raising the temperature to 100°C for 15 minutes in a closed sterilised container.

3. Drying: Milk is passed over heated rollers and converted to milk powder. Being easily digestable, it is an ideal baby-food. But now this milk powder as baby food is being condemned.

4. Condensed milk: Milk is gradually heated under pressure to reduce water contents to about 1 /4th of its original volume and then packed in sealed tin. The varieties are full cream or skimmed milk both in sweetened and unsweetened forms.

5. Addition of antiseptic e.g., boric acid, sulphurous acid, N202. This is however not used in practice.

6. Pasteurisation is the best and most successful practical method, as it ensures destruction of pathogenic organisms by heat without altering the physical character of the milk.

Pasteurisation

The milk is heated to 145°-150°F, for half an hour and then rapidly cooled to 55°F. This retains the enzymes, taste, flavour and nutrients of milk. The milk is kept free of contamination from the time of heating till its delivery to consumers. Two common methods of pas­teurisation are:

1. Holder's method: Milk is heated in cylindrical tanks with steam passed in water jackets surrounding it to 145°-150°F for 30 minutes and then cooled rapidity to 55°F by passing cold water through the jackets.

2. Flash method or high temperature short time (H. T.S. T.) method:

Here milk is heated 1600-1700F for a few seconds and then quickly cooled to 50°F. Holder's method is usually considered more satisfac­tory although H.T.S.T. method is being perfected.

For a satisfactory town milk scheme, the following points should be considered.

1. Improvement of cattle breed, free of diseases.

2. Sanitary cattle shed with efficient drainage and enough water supply to ensure proper cleaning.

3. Milkmen should be free from infectious diseases and trained to observe scrupulous hygienic precautions while milking and han­dling the milk, which should be in clean containers and protected from flies.

4. The milk should be first chilled, if far away from pasteurisation plants and then transported, pasteurised and sealed in bottles.

5. For practical observance of above mentioned measures, there should be proper legislative control by public health department.

Test for pasteurisation: To test for adequte pasteurisation process, following tests are carried out:

1. Phosffhatase test: Phosphatase (an enzyme) is normally present in milk and is inactivated during pasteurization. The presence of phos-phatase in the milk indicates inadequate pasteurisation. This test is useful in Holder's method but is not so reliable in H.T.S.T. method, in which phosphatase may not be completely inactivated, in spite of efficient pasteurisation.

2. Coliform bacilli test: Coliform bacilli present in milk are destroyed by pasteurisation. Their presence in milk means either inadequate pasteurisation or recon lamination of milk at some later stages.

Milk-borne Diseases

These are tuberculosis, typhoid, paratyphoid, dy sentry, cholera, diphtheria, sore throat and undulant fever, infectious hepatitis, poliomyelitis, etc.

Other Preparations of Milk

Dahi (curd) prepared by boiling, wanning the milk and adding a little curd. The fermentation is by lactic and bulgaris bacilli. It is easily digested.

Butter milk is made by churning curdled milk and removing but­ter.

Butter contains fat (80-90%), lactose, salts, traces of casein and arom-tic principle. It is very nutritious and easily digestible among all fats.

Ghee: It is clarified butter and largely used in tropical countries in preference to butter, as it can be preserved for longer period.

Cheese is a concentrated protein food and has about 30% fat and 28% casein.

Skimmed milk and cream are made with centrifugal machine. Cream is removed and skimmed milk is left over.

Significance of Rational Nourishment

Milk and milk products are sources of high biologically valuable protein (aminoacid number of cow’s milk is 0.95 and female aminoacid number is 1.0). From daily norm of consumed milk or sour milk products  (500 ml) the man gets 17.5 g of protein, from sour cheese (100 g) - 18 g, and from firm cheese (50 g) - 13 g.

The milk sugar (lactose) is unique carbohydrate which is slowly hydrolyzed in intestinal tract and has very slow intestinal absorption. Lactose is splitted by sour milk microorganisms and transformed to lactic acid which makes bactriostatic action to putrefactive microflora, does not cause fermentation and promotes reabsorption of calcium.

Milk and milk products are the main sources of assimilation of calcium. With daily norm of consumed milk come 600n mg of calcium, with sour cheese - 160 mg, with firm cheese - 520 mg.

Fatty milk concentrate is the source of vitamin A (cream with 20 per cent of fat content 0.15 mg, sour cream with 30% of fat content 0.25 mg, butter content - 0.59 mg of vitamin A in 100 g of product). Deficiency of milk is low content of hemopoietic main elements like feerum, copper and vitamin C.

 

Vegetable Foods

These are cereals, pulses, roots, green vegetables, fruits and nuts.

Cereals are mainly carbohydrates and also contain minerals (P, Cal, Mg, K and Fe). Wheat and rice are the main cereals. Good wheat flour must have at least 8% gluten. Usually it has 60-70% car­bohydrates and 10-12% gluten.

Rice is poor in proteins, fat and minerals, but very rich in starch.

Barley is rich in proteins and minerals.

Maize is rich in proteins, carbohydrates and fatty matter.

Oat is rich in protein and carbohydrates.

Bajra is rich in protein and carbohydrates.

Pulses are nitrogenous substances. Vegetable protein is legumin (24-25%). Minerals are potassium, calcium and sulphur. Pulses also contain carbohydrates but are deficient in fats.

Roots and tubers ^.potatoes, beet-roots, carrots etc,

Vegetables arc usually a rich source of minerals and vitamins.

Fruits: These may be food fruits or fruits of flavour fruits.

Flavour fruits orange, lemon. These quench thirst and are rich in Vit C and minerals.

Nuts like ground nut are very rich in proteins.

In general, vegetable foods form more bulk and have less protein. If proportion of vegetable in food is very high, the bowels get dis­tended and there is more muscular effort on intestine and more blood and energy required for the purpose.

Beverages and condiments are substances which enable food to be taken with pleasure and relish and aid digestion. These are water (universal beverage) tea/ coffee, fermented drinks, spices, etc.

 

Metabolism

It is process of chemical changes occurring in the body after diges­tion and absorption of food nutrients, their utilisation by body tissue, for processes of synthesis (anabolism) and for those of breakdown (catabolism).

Energy for basal metabolism: This is the energy necessary for maintaining body temperature and for activity of heart and vital organs, when body is at complete rest The basal metabolic rate (BMR) of an average adult is 1500-1700 Cal/day and is dependent on body weight, age, sex, state of health, mental state and the environments.

Food Calorie

A calorie is defined as the amount of heat required to raise the temperature of 1 gm of water through 1°C from 14.5°C to 15.5°C.

Unit of Food (Cal.) 1 - 1,000 small calories.

·        1 gm. of carbohydrate produces    4.1 Cal.

·        1 gm. of fat produces             9.3 Cal.

·        1 gm. of protein produces          4.1 Cal.

Family co-efficient: It is relative energy requirement of various members of household in terms of such units expressed as mean value taken as one:

So for adult male unit is            1

For adult female unit is          0.9

For pregnant women unit is      1.2

For nursing mother unit is        1.5

BALANCED DIET

Balanced diet is one, which will meet a person's caloric need and contain all nutrients, particularly proteins, and vitamins. In addition, the food should satisfy the taste and desire of a person and should have enough roughage to promote the peristalsis. Balanced diet should have 50-60% carbohydrates 30-35% fets and 10-15% proteins with necessary vitamins and minerals.

PROTEINS

Описание: Описание: Описание: Resonance structures of the peptide bond that links individual amino acids to form a protein polymer.

The word "protein" means that which is of first importance. Indeed they are of the greatest importance in human nutrition. Proteins are composed of carbon, hydrogen, oxygen, nitrogen and sulphur in varying amounts. Some proteins also contain phosphorus and iron and occasionally other elements. Proteins differ from carbohydrate and fat in the respect that they contain nitrogen. Proteins are made up of simpler substances, called amino acids. These are the building blocks of protein.

Some 22 amino acids are stated to be needed by the human body, out of which eight are called "essential". The essential amino acids are: (1) Isoleucine (2) leucine (3) lysine (4) methionine (5) phenylalanine (6) threonine (7) tryptophane; and (8) valine. These are called "essential" because the body cannot synthesize them in sufficient quantity, and therefore they must be obtained from the food we eat.

Functions :

Proteins are needed by the body: -

1                 For growth and development: They furnish the building material, i.e. the amino   acids  from which  the  body proteins are synthesized.

2                 For repair of body tissues and their maintenance: It has been shown that the   body   proteins   are   constantly being broken down; they have to be replaced   for   which   fresh   protein intake is required.

3                 For synthesis of antibodies, enzymes and hormones: Antibodies, enzymes and hormones contain protein. The body   requires   protein   to   produce them.

4               Proteins can also furnish energy to the body, but generally the body depends for its energy on carbohydrates and fats rather than proteins.

Sources:

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There are two main dietary sources of protein: -

Animal sources:   milk,   eggs,   meat, fish, etc.

Plant sources: Pulses, cereals, nuts, etc.

A mixed diet containing both animal and vegetable proteins meets with the needs of essential amino acids required by the body. Each gm. of protein on oxidation yields 4.1 calories of heat.

Protein rich foods are milk, lean meat, fish, poultry, eggs, nuts, legumes, beans and pulses.

The protein content of some foods is given in Table 2.

Protein requirements

It is customary to express protein requirements in terms of body weight. Doctors recommended 1,0 g. protein/kg, body weight for an adult. Daily allowances recommended by the ICMR for various population groups are given in Table 16 (see page 113).

Effects of protein deficiency:

The effects of protein deficiency may summarise as below.

During pregnancy: Still birth,   low birth weight, anaemia

Infancy     and     early     childhood:  Marasmus,     kwashiorkor,     mental retardation,    stunted    growth    and development

Adults: Loss of weight, underweight, poor musculature, anaemia, increased susceptibility to infection, frequent loose stools, general lethargy, incapacity to sustained work, delay in wound healing, cirrhosis of liver, oedema, ascitis, etc.

 

FATS and HYDROCARBONS.

Описание: Описание: Описание: Fats header

 Fats are composed chemically of carbon, hydrogen and oxygen, only in different proportion than they are contained in car­bohydrates. There is less of oxygen in fats than in carbohydrates. The true fats are glycerides of fatty acids and butter, ghee, vegetable hydrogenated oil, animal fat etc. are the examples of various fats com­monly used by people. Fats are a form of con­centrated food and like carbohydrates; they are used as body fuels for the production of heat and energy. As fats are not soluble in water, the process of digestion changes the fat into an emulsion form for their ab­sorption into the body. Liquid fats and those which melt at body temperature are somewhat better digested than those which are much harder. A fat-rich diet slows the process of digestion and gives a feeling of heaviness and fulness. In the body, the fat which cannot be immediately used, is partly deposited as adipose tissue under the skin and partly unabsorbed passes out with the faeces. Excessive intake of animal fats increases blood cholesterol level, which may be a contributory factor for the development of heart diseases. Certain unsaturated fatty acids in fats are considered essential for health. Fat soluble vitamins are present in animal fats. Fat diminishes protein metabolism and therefore is called protein sparing food. The daily diet of an adult should include 45 to 60 gms. of fat.

Sterols. These are substances which resemble fats only in their physical properties and solubilities. Ergosterol and cholesterol are the examples of this group and are associated in the body in the bile, nervous tissue and blood corpuscles.

Some fats such as groundnut oil, gingely oil are liquid at room temperature: some fats such as ghee and butter are solid at room temperature. Fats are again classified into saturated and unsaturated fats. In general, animal fats are "saturated" fats; vegetable oils and fats are "unsaturated" fats. Current researches indicate that excessive intake of saturated  fats (i.e., animal fats) is harmful to the body. Cardiovascular disease which is a frequent disease in the western countries and among the well-to-do people in India is attributed to excessive consumption of saturated fats.

Fats


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Most people know that we should be cutting down on fat. But did you know it's even more important to try to replace the saturated fat we eat with unsaturated fat? Read on to find out how.

We need some fat


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It's important to have some fat in our diet because fat helps the body absorb some vitamins; it's a good source of energy and a source of the essential fatty acids that the body can't make itself. But having a lot of fat makes it easy to have more energy than we need, which means we might be more likely to put on weight. Different sorts of fats

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Although it's important to try to eat less fat, we also need to think about the types of fat we are eating. We should be cutting down on food that is high in saturated fat or Trans fats or replacing these foods with ones that are high in unsaturated fat instead. We should also be having more omega 3 fatty acids, which are found in oily fish.

Saturated fats

Having too much saturated fat can increase the amount of cholesterol in the blood, which increases the chance of developing heart disease.
These are all high in saturated fat:

·                     Meat products, meat pies, sausages

·                     Hard cheese

·                     Butter and lard

·                     Pastry

·                     Cakes and biscuits

·                     Cream, soured cream and crème fraîche

·                     Coconut oil, coconut cream or palm oil

 

Tran’s fats

Tran’s fats have a similar effect on blood cholesterol as saturated fats; they raise the type of cholesterol in the blood that increases the risk of heart disease. Some evidence suggests that the effects of these Trans fats may be worse than saturated fats. However, most people eat a lot more saturated fat than Tran’s fats. Tran’s fats can be formed when liquid vegetable oils are turned into solid fats through the process of hydrogenation. Foods containing hydrogenated vegetable oil, which must be listed in the ingredients list on the label, might also contain Tran’s fats. Tran’s fats are often found in these types of foods:

·                     Biscuits and cakes

·                     Fast food

·                     Pastry

·                     Some margarine

These sorts of food are usually high in saturated fat, sugar and salt so if you are trying to eat a healthy diet, you should try to keep these to a minimum. Tran’s fats are also found naturally at very low levels in foods such as dairy products, beef and lamb.

Unsaturated fats

Unsaturated fats can be a healthy choice. They don't raise cholesterol in the same way as saturated fats. These types of fats provide us with the essential fatty acids that the body needs. These include the unsaturated fats found in oily fish, which may help prevent heart disease. These are all high in unsaturated fat:

·                     Oily fish

·                     Avocados

·                     Nuts and seeds

·                     Sunflower, rapeseed and olive oil and spreads

·                     Vegetable oils

If you want to make a healthy choice, try to have more unsaturated fats and less saturated fat, this means you could choose:

·                     Oily fish instead of sausages or a meat pie

·                     use unsaturated oils such as olive, sunflower or rapeseed oils instead of butter, lard and ghee in cooking

·                     Snack on some unsalted nuts instead of a biscuit

·                     make your mashed potato with olive oil and garlic instead of butter and milk for a change

·                     choose a fat spread that is high in unsaturates instead of butter

More on a healthy heart

 

What's a lot and what's a little?

If you want to try to cut down on fat, or you just want to watch how much fat you are eating, you can compare the labels of different food products and choose those with less total fat and less saturated fat. You will see figures for the fat content on many food labels and some foods will also give figures for saturated fat. Use the following as a guide to what is a lot and what is a little fat per 100g food. 20g fat or more per 100g is a lot of fat 5g saturates or more per 100g is a lot 3g fat or less per 100g is a little fat 1g saturates or less per 100g is a little fat If the amount of total fat is between 3g and 20g per 100g, this is a moderate amount of total fat. Between 1g and 5g of saturates is a moderate amount of saturated fat.

Tips for cutting down

Here are some practical suggestions to help you cut down on fat, especially saturated fat:

·                     Choose lean cuts of meat and trim off any visible fat.

·                     Grill, bake, poach or steam rather than frying and roasting so you don't need to add any extra fat.

·                     If you do choose something high in fat such as a meat pie, pick something low fat to go with it to make the meal lower in fat – for example you could have a baked potato instead of chips.

·                     When you're choosing a ready meal or buying another food product, compare the labels so you can pick those with less total fat or less saturated fat.

·                     Put some extra vegetables, beans or lentils in your casseroles and stews and a bit less meat.

·                     Measure oil for cooking with tablespoons rather than pouring it straight from a container.

·                     Have pies with only one crust rather than two – either a lid or a base – because pastry is very high in fat.

·                     When you're making sandwiches, try not using any butter or spread if the filling is moist enough. When you do use fat spread, go for a reduced-fat variety and choose one that is soft straight from the fridge so it's easier to spread thinly.

·                     Choose lower fat versions of dairy foods whenever you can. This means semi-skimmed or skimmed milk reduced fat yoghurt, lower fat cheeses or very strong tasting cheese so you don't need to use as much.

·                     Instead of cream or soured cream try using yoghurt or fromage frais in recipes.

Omega 3 fatty acids

Oily fish is the best source of omega 3 fatty acids. These fatty acids have been shown to help protect against coronary heart disease.  Some omega 3 fatty acids are found in certain vegetable oils, such as linseed, flaxseed, walnut and rapeseed, but these aren't the same type of fatty acids as those found in fish. Recent evidence suggests that the type of fatty acids found in vegetable sources may not have the same benefits as those in fish.

Functions:

 Fats serve the following functions:

1    Dietary fat is a concentrated source of energy. One gram of fat supplies 9 calories of energy. This is almost twice the number of calories derived weight for weight, from carbohydrate or protein.

2     Fats are carriers of fat-soluble vitamins, e.g., vitamins A, D, E and K.

3   Dietary   fat supplies "essential fatty   acids". Linoleic   acid, one of the ssential fatty acids, prevents scaly skin formation. In general, essential fatty acids are needed for growth and maintenance of the integrity of the skin.

4      The fat layer below the skin plays an important role in maintaining our body temperature.

5   Fats provide support for many organs in the body such as heart, kidney, intestine etc.

6   Foods containing fats are tasty.

Sources:

Dietary fats are derived from two main sources - animal and vegetable sources.

Animal   sources:   These are ghee, butter, fat of meat, fish oils, etc.

Vegetable sources: These are various vegetable oils such as groundnut, gingely, mustard, cottonseed, safflower (kardi) and coconut oil.

CARBOHYDRATES

Описание: Описание: Описание: Lactose is a disaccharide found in milk. It is pivotally composed of a molecule of β-D-galactose and a molecule of β-D-glucose bonded by a β1-4 glycosidic linkage.

They form the largest component of diet of most of the people and furnish most of the required energy. Starches and sugars are grpuped under this head. Wheat, rice, maize, barley, cereals, potatoes, sweet potatoes, turnips, root vegetables etc., are rich in starches, while sugarcane, beetroot and fruits contain the sugars. The original source of all starches and sugars is green plants. When plants have excessive sugar and they need to store it, as reserve supply of food, plant body is capable of changing its sugar into starch. Carbohydrates are abundantly present in food. All carbohydrates have to be changed into glucose and fructose before they can be absorbed into the body. 1 gm of sugar yields 4.1 calories of heat. Chemically carbohydrates are composed of carbon, hydrogen and oxygen as the name implies. Polysaccharides are various starches which are converted into two molecules saccharides i.e.> cane sugar, beet sugar, milk sugar and malt sugar. These on further digestion change into single molecule monosaccharides, glucose and fructose. The daily requirement of car­bohydrates varies from 50 to 60% of total energy intake.

The carbohydrates are chief sources of energy. Over half the energy requirements of the body are met with by carbohydrates. In the active muscles, the glacose is oxidised for the production of energy and warmth. Glucose which cannot be used imme­diately, is converted into glycogen and stored in the liver and muscles or converted into fat and stored under the skin.

Sources: Описание: Описание: Описание: Grain products are rich sources of complex carbohydrates

There are three main sources of carbohydrate:

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MINERAL SALTS

Vitamins and minerals.

These are essential for the main­tenance and growth of the body. They also maintain the normal osmotic pressure in the fluids and tissues of the body, besides playing an important part in the acid alkali regulation of the body. They are also required to make good the loss of salts excreted in urine and sweat. The alkali forming elements are calcium, potassium, sodium, iron and manganese. The acid forming elements are phosphorus, sulphur and chlorine.

The main functions of salts in the body are:

1.      To maintain tone of muscles, nerves and blood.

2.      To stimulate digestive secretions.

3.      To help general growth of the body.

4.      To    help    in    maintaining    acid    alkali equlilibrium.

5.      To maintain rigid structure of body such as bones, teeth etc.

In the human body there are at least 15-16 dif­ferent mineral elements and each has its own specific part to play.

The following mineral salts are, however, most important from nutrition point of view:

1.                  Calcium. It is the chief constituent of bones and teeth. It gives rigidity, strength to bones and hardness, shine to the teeth. It controls rhythmic activities of the heart and contractile muscles. It is essential for the coagulation of blood. It is required in much greater amount during the periods of pregnancy and lactation. Its daily requirement for an average adult is 1 gm. and for lactating mother 1.5 Gms. Calcium metabolisms is closely related to phosphorus and vitamin D. Its deficiency leads to poor development of bones and teeth, rickets, osteomalacia, delayed blood coagulation, hyperplasia of parathyroid glands and low calcium tetany. The best sources of lime salts are milk, cheese, eggs, dark green leafy vegetables and dried fruits. The calcium of green vegetables is, however, not so easily absorbed as the calcium of milk.

2.                  Phosphorus. It is contained in every cell of the body. It is essential for the multiplication of cells and the growth of body. It works with calcium in bones and teeth. Its daily requirement in the diet is 1.5 Gms. But mqre of it is required during pregnancy. Its deficiency is characterised by softening of bones, caries of teeth, stunted growth, changes in the reaction of blood and depression of vital processes. Its chief sources are cheese, yolk of eggs, oatmeal, almonds, nuts, peas, bones, whole wheat, liver, milk, potatoes etc. In cereals about 50 to 80% of phosphorus is present in the form of phytic acid, i.e., inositol hexosephosphoric acid.

3.                  Iron. It is the main constituent of haemoglobin of blood and nuclei of the cells. It acts as an oxygen carrier to the lungs and tissues and plays an important part in the oxidation and catalysis of enzymes. Its daily requirement is 25 mgms. But an adult woman needs more of iron to compensate for loss of blood in menstruation and also during pregnancy, lactation etc. An adult person has about 3-4 gms of iron out of which 2.4-2.7 gms. Exist in the form of haemoglobin. Its deficiency causes anaemia. Its chief sources are liver, red meat, eggs, pulses, cereals, onion, green leafy vegetables, dry fruits, dates, figs, resins etc. Human milk contains 1 mg. of iron per litre.'

4. Iodine. It occurs in all the tissues and fluids of the body. It is an essential constituent of thyroid gland. Its iodine rich secretion thyroxin regulates the metabolism. Its daily requirement is about 150 Gms. This may be increased during puberty, pregnancy and menopause. Its deficiency causes goitre. Its chief sources are seafish, cod liver oil, yolk of eggs, onions and fresh vegetables. Iodised table salt is used to supply the iodine in endemic goitre areas. The minimum daily requirement of iodine for an adult person is 0.15 mg. to 0.30 mg.

5. Sodium Chloride. It occurs in all the tissues and fluids of the body. It maintains osmotic pressure in blood and other tissue fluids. It is essential for the maintenance of PH ion concentration. It is present in gastric juice and bile. Its daily requirement is 10 to 15 Gms. Its deficiency leads to cramps, marked general weakness, mental lassitude, dyspnoea on exertion and heat exhaustion. These symptoms can be delayed or even prevented by drinking of water containing 0.25% of sodium chloride.

6.  Copper.   It   helps   in   the   formation   of haemoglobin of blood along with iron. Its daily requirement is 2 Gms. for adult people.

7.  Chlorine. It is necessary to maintain the composition of blood and also in the formation of hydrochloric acid in the body. It is found in common salt, bananas, tomatoes, lettuce and green leafy vegetables.

VITAMINS

Vitamin and mineral ABCs

Vitamins and minerals are substances your body needs in small but steady amounts for normal growth, function and health. Together, vitamins and minerals are called micronutrients. Your body can't make most micronutrients, so you must get them from the foods you eat or, in some cases, from supplements.

Vitamins: Partners in regulating body functions

Vitamins are needed for a variety of biologic processes, among them growth, digestion, mental alertness and resistance to infection. They also enable your body to use carbohydrates, fats and proteins, and they act as catalysts — initiating or speeding up chemical reactions. Though vitamins are involved in converting food into energy, they supply no calories.

Vitamins can be either water-soluble or fat-soluble.

Water-soluble vitamins. Vitamin C, biotin and the seven B vitamins — thiamin (B-1), riboflavin (B-2), niacin (B-3), pantothenic acid (B-5), pyridoxine (B-6), folic acid (B-9) and cobalamin (B-12) — dissolve in water (water-soluble) and aren't stored in your body in any significant amounts. Surplus water-soluble vitamins are simply excreted in your urine.

Fat-soluble vitamins. Excess fat-soluble vitamins can accumulate in your body and become toxic. You're especially sensitive to excess amounts of vitamins A and D. Because vitamins E and K affect blood clotting, talk with your doctor before taking a supplement that contains either of these vitamins if you're taking a blood thinner, such as warfarin (Coumadin).

Minerals: Building blocks for your body Minerals are the main components in your teeth and bones, and they serve as building blocks for other cells and enzymes. Minerals also help regulate the balance of fluids in your body and control the movement of nerve impulses. Some minerals also help deliver oxygen to cells and help carry away carbon dioxide.

Minerals have two categories:

Major minerals. Calcium, phosphorus, magnesium, sodium, potassium, sulfur and chloride are considered major minerals because adults need them in larger amounts — more than 250 milligrams (mg) a day.

Trace minerals. Chromium, copper, fluoride, iodine, iron, manganese, molybdenum, selenium and zinc are considered trace minerals because your body needs them in smaller amounts — fewer than 20 mg a day.

Whole foods: Your best source of micronutrients

Whole foods are your best sources of vitamins and minerals. They offer three main benefits over supplements:

   Whole foods are complex. They contain a variety of the micronutrients your body needs — not just one. An orange, for example, provides vitamin C but also beta carotene, calcium and other nutrients. A vitamin C supplement lacks these other micronutrients.

Whole foods provide dietary fiber. Fiber is important for digestion and can help prevent certain diseases such as cancer, diabetes and heart disease. Adequate fiber intake can also help prevent constipation.

Whole foods contain other substances that appear to be important for good health. Fruits and vegetables, for example, contain naturally occurring food substances called phytochemicals, which may help protect you against cancer, heart disease, diabetes and high blood pressure. Many are also good sources of antioxidants — substances that slow down oxidation, a natural process that leads to cell and tissue damage. If you depend on supplements rather than eating a variety of whole foods, you miss the potential benefits of these substances.

Who needs vitamin and mineral supplements?

Many people don't receive all of the nutrients they need from their diet because they either can't or don't eat enough, or they can't or don't eat a variety of healthy foods. For some people, including those on restrictive diets, multivitamin-mineral supplements can provide vitamins and minerals that their diets often don't. Pregnant women and older adults have altered nutrient needs and may also benefit from a supplement.

Choosing and using supplements

Supplements, as the term suggests, can complement your regular diet, but they aren't food substitutes. They can't replace the hundreds of nutrients found in whole foods. But if you do decide to take a vitamin or mineral supplement, consider these factors:

     Check the supplement label. Read labels carefully. Product labels can tell you what the active ingredient or ingredients are, which nutrients are included, the serving size — for example, capsule, packet or teaspoonful — and the amount of nutrients in each serving. The label also provides directions for safe use and tips for storage along with the name and address of the manufacturer, packer or distributor where you can write if you need more information on a particular product.

 Avoid supplements that provide "megadoses." In general, choose a multivitamin-mineral supplement — for example, Centrum, One A Day, others — that provides about 100 Percent Daily Value (%DV) of all the vitamins and minerals instead of one that supplies, for example, 500%DV of one vitamin and only 20%DV of another. The exception to this is calcium. You may notice that calcium-containing supplements don't provide 100%DV. If they did, the tablets would be too large to swallow. Most cases of nutrient toxicity stem from high-dose supplements.

   Look for “USP” on the label. This ensures that the supplement meets the standards for strength, purity, disintegration and dissolution established by the testing organization, U.S. Pharmacopeia (USP).

      Beware of gimmicks. Synthetic vitamins are usually the same as so-called "natural" vitamins, but "natural" vitamins usually cost more. And don't give in to the temptation of added herbs, enzymes or amino acids — they add mostly cost.

     Look for expiration dates. Supplements can lose potency over time, especially in hot and humid climates. If a supplement doesn't have an expiration date, don't buy it. If your supplements have expired, discard them.

   Store all vitamin and mineral supplements safely. Store supplements in a dry, cool place. Avoid hot, humid storage locations, such as the bathroom. Also, store supplements out of sight and away from children. Put supplements in a locked cabinet or other secure location. Don't leave them on the counter or rely on child-resistant packaging. Be especially careful with any supplements containing iron. Iron overdose is a leading cause of poisoning deaths among children.

Play it safe. Before taking anything other than a standard multivitamin-mineral supplement of 100%DV or less, check with your doctor, pharmacist or a registered dietitian. High doses of some vitamins or minerals may cause health problems. For example, high doses of vitamin B-3 (niacin) can result in or worsen liver problems, and too much vitamin A over time may cause liver problems or weaken bones in women. In addition, supplements may interfere with your medications. For instance, vitamin E isn't recommended if you're taking blood-thinning medications (anticoagulants) because it can complicate the proper control of blood thinning. If you're already taking an individual vitamin or mineral supplement and haven't told your doctor, discuss it at your next checkup.

These are complex organic substances contained in food and are very essential for the normal growth and nutrition of animals. In fact, they are vital accessory food factors required for the maintenance of optimum, health. Recent observations of diseases in men and experiments on animals have shown that these diseases result from deficiency in the diet of certain constituents of fresh vegetables and animal foods called vitamins. They are present in various foods in minute quantities and diet devoid of vitamins, if taken for some period, gives rise to certain diseases known as deficiency diseases and may ultimately even cause death. They do not supply energy but are simply protective foods.

Classification of Vitamins.

http://www.chemistry.wustl.edu/~courses/genchem/Tutorials/Vitamins/home.htm

The vitamins may be classified as under:

 I. Fat Soluble; II.Water Soluble

I. Fat Soluble Vitamins.

These are: (1) Vitamin A or Fat Soluble A (Retinol) is a glamour or protective vitamia Akin to a fertiliser of "lawn" it performs a variety of functions in the epithelial tissues in the body. It is a safety valve for the visual process and the lung tissues.

It is anti-infective and growth-promoting vitamin. Its deficiency causes the following effects:

1.       Retards growth and lowers resistance to bacterial infection.

2.       Xerosis.

3.       Night blindness (inability to see in dim light) due to retardation of the regeneration of visual purple.

4.       Atrophy of the cells of salivary glands and mucous membrane of the intestines,

5.       Dryness of skin owing to atrophy of the sweat and sebaceous glands or Keratinisation of epithelial tissues; a condition resembling "Toad skin" occurs,

6.       Formation of phosphatic calculi,

7.       Respiratory infections like common colds, bronchitis etc.

8.       Faulty development of teeth and spongy gums.

Pro-vitamin A is present in abundance in the yellow pigment of plants known as Carotene which has been isolated in the pure form. Fat soluble Vitamin A is present in milk, butter, ghee, fish fat, cod liver oil, kidneys, mutton, eggs and other animal fats. Green leafy vegetables, fruits, carrots, cabbage, mangoes and papaya are rich sources of vitamin A. It is not destroyed by ordinary cooking, although if cooking is prolonged or if the food is exposed to air it gets destroyed. Human requirement for vitamin A is 5,000 International Units for adults daily, being equivalent to 1.2 microgramme of carotene.

(2) The Sun Shine Vitamin D (Anti-Rachatic Vitamin) fotoRickets.jpg  transforms calcium and phosphorus into bones. It is essential for good teeth, better sleep, relaxation and for prevention and cure of rickets and osteomalacia. It is thermostable i.e., withstands high temperature uninjured. It is present in egg yolk, cod liver oil, halibut liveroil, butter fat and ghee, etc., in the form of Cholecakiferol (Vitamin D3). Cod liver oil is the richest source of vitamin D. In this respect 5 eggs are equivalent to 1 teaspoonful of cod liver oil.   Calciferol   is   a   preparation produced by the irradiation of ergosterol with ultraviolet rays and is termed as vitamin D2. Naturally it is produced in the skin by the action of ultraviolet rays of sun. A liberal supply of vitamin D to mothers during gestation and lactation renders their children less susceptible to rickets. Moreover, it corrects, improper balance of calcium and phosphorus intake and is necessary for their absorption. Its deficiency leads to rickets and dental caries in children and osteomalacia in adults, particularly among women observing purdah or persons dwelling in dark houses, where sunshine is not readily accessible. Daily requirement of this vitamin in children and adults is 400-1000 International Units.

(3) Vitamin E or Anti-Sterility Vitamin. It was discovered by Dr. Evans of U.S.A. who named it Vitamin E. It is also a fat soluble vitamin. It is stable to heat and light, but is destroyed on oxidation, specially in the presence of alkaline salts. It promotes reproduction. It is present in wheat, cereal embryos, green leaves of plants and some vegetable oils. Tocopherol, an oil extracted from wheat germ is the most potent known source of Vitamin E. Its deficien­cy leads to death of foetus in uterus and sterility in males and females of the lower animals. It is therapeutically used in threatened and habitual abortion.

(4) Vitamin K or Coagulation Vitamin. It is essen­tial for the normal coagulation of the blood. Its sour­ces are green leaves, spinach, cauliflower, cabbage, carrot-tops, etc. The part of the plants which con­tains chlorophyll usually has the largest amount of vitamin K. It is stable to heat. Its main function is the formation of prothrombin. Its deficiency leads to hypoprothrombinemia, occurrence of haemor­rhages in the skin and subcutaneous tissues of organs due to prolongation of blood-clotting.

II. Water Soluble Vitamins.

These are: (1) Vitamin B Complex. If а members of this group are absent from the diet, they produce:

Anorexia leading to complex distaste for all food and relieved by aneurin.

From the complex mixture the following con­stituents have been isolated:

Vitamin B1 is sensitive to heat Aneurine hydrochloride or Thiamine is the synthetic preparation used. It is considered anti-neurotic and anti beri-beri, dries or wet. Its deficiency is like "an automobile with a full tank of gasoline, but no spark to ignite it". As a morale vitamin, a lack of it means loss of appetite, indigestion, constipation, nausea, weak heart muscles, palpitation, breathlessness and degeneration of nervous system. It is present in brewers yeast, beans, bran, wheat germ oil, sun flowers seeds, nuts particularly ground nut, meat, fish, eggs etc. Milk and highly milled rice are its poor sources. The use of anti-biotics and alcohol adversely affects this vitamin. The daily requirement of this vitamin is 2 mg.

Vitamin B2. It is of great value in human nutri­tion. It is designated as Riboflavine. It is a water soluble yellow pigment and is found in yeast, milk, eggs, fishroe, pork, liver and green leafy vegetables. It is highly heat stable and survives even canning. It is essential for the main­tenance of normal fat metabolism. Ocular manifes­tations, chelosis, photophobia, burning, itching an­gular stomatitis, glossitis and dermatitis of skin are due to its deficiency, which occurs most commonly in those individuals or communities whose diet con­sists mainly of milled rice. The estimated daily re­quirement of this vitamin is about 2-3 m. gms.

Vitamin P.P (Pellagra-preventing factor) Niacin or Nicotinic Acid is the factor concerned in pellagra. It is remarkably stable, capable of withstanding heat, oxidation and ultra violet light. It maintains healthy condition of skin and mucous membrane. Its sources are meat, liver, kidneys, yeast, whole meal flour, bread, green vegetables, mangoes, etc. Its deficiency leads to pellagra which is charac­terised by 3 D's—dermatitis, diarrhoea and demen­tia. The most typical symptom is erythema. Its daily requirement is about 15-30 m. gms.

Vitamin B6, or Pyridoxine or anti-Dermatitis Vitamin. It is essential for normal protein metabolism. It is necessary for haemoglobin syn­thesis and also as an anti-dermatitis factor. It is present in rice polishing, yeast, and liver, yolk of eggs, fat, peanuts and wheat germs. Its deficiency leads to muscular dystrophy, rigidity and dermatitis in rats.

Biotin, Vitamin H. It is related to fat and car­bohydrate metabolism. Its chief sources are liver, eggs, yeast and cereals. Its deficiency causes der­matitis and eczema. Its daily requirement is 150 gm.

Folk Acid. It stimulates blood formation. It is important for haemopoietic factor and is used extensively in macrocytic and pernicious anaemia. It is present in liver, kidneys, yeast and leafy vegetables.

Inositol (Mouse Anti-Alopecia Factor). It is associated in some way with metabolism or transport of fat. It is important for anti-alopecia factor. Its deficiency is characterised by loss of hair.

Vitamin B12 Cyanocobalamin. It has been isolated from liver. It cures pernicious anaemia in very small doses. It is a "Pep" vitamin for a healthy nervous system and the production and development of red blood cells. It is highly useful among confused, depressed, anaemic and forgetful persons. It is a costly vitamin, since about a ton of liver is required to prepare only 20-25 m.gm. of vitamin B12.

Para-Amino-Benzoic Acid. It helps tissue oxidation.

Pantothenic Acid. It is also known as "chick anti-dermatitis factor." It is used in the form of cal­cium salt, which is a white crystalline salt and is odourless. Its deficiency causes burning on the soles and palms, dermatitis and defective vision. Its daily human requirement is 100 m. gm.

Choline. Its deficiency causes deposition of fat in liver, degeneration of liver and kidneys. Its daily requirement is 2 Gms.

II. Vitamin C or Anti-Scorbutic Vitamin. It is chiefly present in all living tissues, fresh fruits such as oranges, lemons, tomatoes, turnips, potatoes and fresh green vegetables. This vitamin is destroyed on prolonged heating and in preservation of fruits. It is an anti-scorbutic vitamin. It is essential for maintaining capillary in­tegrity and for formation of intercelluar substance. It is essential for the maturation of red blood cor­puscles. Its deficiency leads to scurvy, a disease characterised by swelling of gums, anaemia, bad teeth, offensive breath, spongy gums, loss of weight, delayed healing of wounds and haemorrhages. The average daily requirement of this vitamin is 50-100 m. gms. Since vitamin C cannot be stored in the body so a daily intake of the recommended dose is neces­sary for good health. 

Vitamin P. It occurs naturally along with vitamin C in fresh fruits, particularly  lemons and fresh salads. It helps in preventing capillary permeability and its deficiency leads to purpura, spontaneous capillary haemorrhages and infiltration of lungs resembling tuberculosis.

Nutritional Diseases:

Important nutritional diseases are listed as hereunder:

1. Protein Calorie Malnutrition (PCM).

Kwashiorkor. It results from consumption of very low protein in diets of low biological values, yet providing just enough energy to satisfy the needs of the child. This condition is usually seen in children between the age group of 1-4 years. This symptom is characterised by pitting oedema, anaemia, retarded growth, loss of appetite, diarrhoea, scanty hair growth...

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Marasmus. It is a clinical condition of protein energy malnutrition, primarily due to totardeprivation of the requisite calories required by the body. It usually occurs in the age group of 1/2 to 5 years. This syndrome is characterised by failure to gain weight, wasting of muscles and of subcutaneous fat. The child feels good appetite but is irritable.

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Marasmic-Kwashiorkor. Patients suffering from Marasmic-Kwashiorkor show clinical symptoms of both Marasmus and Kwashiorkor.

2. Protein Deficiency in Adults. Protein deficiency in adults is also quite prevalent in poverty areas. Protein  deficiency  will  result  in  adults  having reduced weight, reduced subcutaneous fat, anaemia, greater susceptibility to infection, frequent loose motions, general lethargy, delay in healing of wounds and oedema.

3. Mineral Deficiencies

Deficiency of iodine in water and feed leads to goitre,

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Lack of flourine ( < 0.5 ppm) in water leads to caries

Calcium deficient diets lead to rickets and osteomalacia

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Iron deficiency diets lead to anaemia,

There are other important minerals like copper, selenium etc.Usually their requirements are so little that deficiency conditions do not occur.

4.  Vitamins Deficiencies,

Lack of vitamin A results in xerophthalmia, Bitot's spots, night blindness and keratomalacia.

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B Complex: Deficiency of Thiamine leads to beri beri. Niacin deficiency results in pellagra.

 

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Riboflavin deficiency symptoms are angular stomatitis, cheilosis, scrotal dermatitis and   corneal  vascularisation. 

 Other   B   Complex eficiencies also result in glossitis, cheilosis and angular stomatitis,

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Vitamin C deficiency leads to scurvy, spongy bleeding gums, haemorrhages in skin and other haemorrhages,

Vitamin D deficiency result in rickets and osteomalacia.

 Vitamin K deficiency leads to hypoprothrombinaemia, which further leads to haemorrhages.

5.  Problems  of Over-nutrition

Obesity: The main features of obesity are overweight and fatness.It is mostly caused by overeating and intake of abun­dance of calories

Obesity
Classification & external resources

 

Hypervitaminosis A is at times caused by excess of vitamin A therapy. The manifes­tation is headache, nausea, vomiting, irritability and anorexia. Carotenaemia is also caused due to excessive consumption of carrots which is charac­terised by yellow skin with normal conjunctiva,

The toxic manifestations of hypervitaminosis D are anorexia, nausea, vomiting, thirst, polyuria and drowsiness. Calcium and phosphorus levels in serum and urine are raised. Calcium may be deposited in many tissues also,

Fluorosis occurs if fluorine is available > 1,5 mg in water. It is characterised by (a) dental fluorosis, i.e., mottled enamel of teeth and (v) skeletal fluorosis i.e., dense bone formation, severe spondylitis and even calcifications of ligaments of spine and tendinous inflamation of other muscles in severe cases.

Effects on health

Obesity, especially central obesity (male-type or waist-predominant obesity), is an important risk factor for the "metabolic syndrome" ("syndrome X"), the clustering of a number of diseases and risk factors that heavily predispose for cardiovascular disease. These are diabetes mellitus type 2, high blood pressure, high blood cholesterol, and triglyceride levels (combined hyperlipidemia). An inflammatory state is present, which — together with the above — has been implicated in the high prevalence of atherosclerosis (fatty lumps in the arterial wall), and a prothrombotic state may further worsen cardiovascular risk.

Apart from the metabolic syndrome, obesity is also correlated (in population studies) with a variety of other complications. For many of these complaints, it has not been clearly established to what extent they are caused directly by obesity itself, or have some other cause (such as limited exercise) that causes obesity as well. Most confidence in a direct cause is given to the mechanical complications in the following list:

While being severely obese has many health ramifications, those who are somewhat overweight face little increased mortality or morbidity. Some studies suggest that the somewhat "overweight" tend to live longer than those at their "ideal" weight. This may in part be attributable to lower mortality rates in diseases where death is either caused or contributed to by significant weight loss due to the greater risk of being underweight experienced by those in the ideal category. Another factor which may confound mortality data is smoking, since obese individuals are less likely to smoke[citation needed]. Osteoporosis is known to occur less in slightly overweight people.

http://healthylife123.blogsome.com/

 

VEGETARIANISM

Vegetarian diets appeal to people for various reasons. For some people, religious and philosophical teachings prompt adherence to a vegetarian regimen. Other people seek health benefits.

There is much to be said for most of us making our food choices in the direction of vegetarian principles, eating less meat and eggs and substituting foods of vegetable ori­gin. Such choices will reduce the amount of fats, particularly the saturated ones, and in­crease the amount of fiber consumed. Although such choices will reduce the amount of protein we eat, most of us con­sume more protein than we need.

At the same time, a poorly planned vege­tarian diet can put you at risk for disorders such as vitamin B12 deficiency iron-deficiency anemia, growth retardation (in persons who have not yet achieved their full adult growth), and osteoporosis, to name a few. Avoiding these risks means devising a healthful vege­tarian diet—that is, one in which all of your body's nutrient needs are met.

Careful planning is the key to such a diet. Because many of the nutrients a human body needs are found most readily in animal prod­ucts, finding substitutes requires effort.

There are various degrees of food restric­tions in vegetarian diets. Total vegetarians, known as vegans, restrict their foods to those of plant origin only. Fruitarians further re­strict their foods to only raw or dried fruits and nuts, honey, and olive oil. Lacto-vegetarians eat foods of plant origin plus milk and other dairy products. Lacto-ovovegetarians eat plant foods, milk and other dairy products, and eggs.

Obviously, the question of the nutritional adequacy of a particular vegetarian regimen depends on the extent of food restrictions. Also, children and teenagers, pregnant and lactating women, and people recovering from a serious illness or injury who are veg­etarians need to take precautions to ensure that all of their body's needs are met. Such people should follow a vegetarian regimen only with the careful supervision of an expe­rienced, registered dietitian.

Protein is of some concern when planning a strict vegetarian diet. Protein found in foods of plant origin tends to have only small amounts of one or more essential amino acids. (Essential amino acids are those that your body cannot manufacture—you must obtain them from your diet.) Protein from an­imal sources contains essential amino acids in an optimal proportion.

Grains and cereals with ingredients in­cluding wheat, com, oats, and rice provide some essential amino acids, while legumes such as peas, peanuts, and dry beans provide others. When, during the course of a day, you combine a grain with a legume, or cornmeal with beans, you have a more nearly complete set of essential amino acids.

Another important nutrient in the vegetarian diet is vitamin B12. Vegetarians who consume milk or eggs will get enough of this vitamin. Those who do not can eat foods ar­tificially enriched with vitamin B12. Some commercial foods made from soybeans and other plant proteins are fortified with vitamin B12. A deficiency of this vitamin is a serious medical disorder.

Vegetarians who eat eggs and dairy prod­ucts also usually receive enough calcium and riboflavin, but the vegan has to devise special dietary strategies. Many foods of plant ori­gin contain calcium, but they may not be as easily used by the body because of the pres­ence of fiber and oxalic acid in the foods. Oxalic acid and fiber may interfere with the body's ability to use the calcium present in the foods. Thus, if you are a strict vegetarian, you may need calcium supplements.

Vitamin D, iron, and zinc are other nutri­tional elements needing special attention in the vegetarian diet. Most of us obtain vita­min D through fortified milk and exposure of our skin to sunlight. If you do not drink milk, you must rely on sunlight or on a vita­min supplement. However, children and pregnant and lactating women who are veg­etarians should not rely solely on sunlight but should take a supplement.

The high fiber content of most vegetarian diets tends to impair the absorption of iron and zinc. Good sources of iron include en­riched cereals and grains, legumes, dates, prunes, raisins, and leafy green vegetables. You can enhance absorption of the iron in vegetables by including citrus fruit or juice or other foods high in vitamin C with meals that contain plant sources of iron. Vitamin C helps increase the iron absorption from plant foods. Good sources of zinc include legumes and nuts.

 

The word nutrient or "food factor" is used for specific dietary constituents such as proteins, vitamins and minerals. Dietetics is  the practical application of the principles of nutrition; it includes   the planning of meals for the well and the sick. Good nutrition means "maintaining a nutritional status that enables us to grow well and enjoy good health". Maintaining a healthy diet is the practice of making choices about what to eat with the intent of improving or maintaining good health. Usually this involves consuming necessary nutrients by eating the appropriate amounts from all of the food groups. Since human nutrition is complex a healthy diet may vary widely subject to an individual's genetic makeup, environment, and health. For around 20% of the planet's population, lack of food and malnutrition are the main impediments to healthy eating.

http://en.wikipedia.org/wiki/Nutrition

Generally, a healthy diet will include:

1. Sufficient calories to maintain a person's metabolic and activity needs, but not so excessive as to result in fat storage greater than roughly 12% of body mass;

2. Sufficient fat, consisting mostly of mono- and polyunsaturated fats (avoiding saturated and "trans" fats) and with a balance of omega-6 and long-chain omega-3 lipids;

3. Sufficient essential amino acids ("complete protein") to provide cellular replenishment and transport proteins;

4. Essential micronutrients such as vitamins and certain minerals.

5. Avoiding directly poisonous (e.g. heavy metals) and carcinogenic (e.g. benzene) substances;

6. Avoiding foods contaminated by human pathogens (e.g. e. coli, tapeworm eggs);

7. Avoiding chronic high doses of certain foods that are benign or beneficial in small or occasional doses, such as

  • foods or substances with directly toxic properties at high chronic doses (e.g. ethyl alcohol, Vitamin A);
  • foods that may interfere at high doses with other body processes (e.g. table salt);

  • foods that may burden or exhaust normal functions (e.g. refined carbohydrates without adequate dietary fiber).

http://www.healthyliving.gov.uk/publications/pub_fulldoc.cfm?TxtTCode=1495

been known to result in death when consumed in extraordinary quantities.

From a psychological perspective, a new healthy diet may be difficult to achieve for a person with poor eating habits. This may be due to tastes acquired in early adolescence and preferences for fatty foods. It may be easier for such a person to transition to a healthy diet if treats such as chocolate are allowed; sweets may act as mood stabilizers, which could help reinforce correct nutrient intake.

It is known that the experiences we have in childhood relating to consumption of food affect our perspective on food consumption in later life. From this, we are able to determine ourselves our limits of how much we will eat, as well as foods we will not eat - which can develop into eating disorders, such as anorexia or bulimia nervosa. This is also true with how we perceive the sizes of the meals or amounts of food we consume daily; people have different interpretations of small and large meals based on upbringing.

While plants, vegetables, and fruits are known to help reduce the incidence of chronic disease, the benefits on health posed by plant-based foods, as well as the percentage of which a diet needs to be plant based in order to have health benefits is unknown. Nevertheless, plant-based food diets in society and between nutritionist circles are linked to health and longevity, as well as contributing to lowering cholesterol, weight loss, and in some cases, stress reduction.

Indeed, ideas of what counts as "healthy eating" have varied in different times and places, according to scientific advances in the field of nutrition, cultural fashions, religious proscriptions, or personal considerations.

The basis of all vital processes of an organism of the man is a constant metabolism between an organism and environment. From an environment the man consumes oxygen, water and food-stuff. The role of nutrition consists in updating energy and fabric elements necessary for correct body growth, developments and functioning of an organism, for maintenance of metabolic processes, normal condition of health and working capacity. The full value of a diet of the people is the important factor, which determines their condition of health, influence on body growth and physical development, working capacity, adaptation opportunity, morbidity and life duration. Just due to the nutrition the continuity of a course of two opposite and mutually connected processes of assimilation and dissimilation is provided.

Kinds of food. In various historical times structure of nutrition and character of a nutrition changed depending on development of industrial forces of a society, climate-geographical conditions, direction of economic activity and so on. The character of nutrition of the population was formed gradually depending on an economic and cultural level of development of the country, in view of national customs and features.

Changing concepts

Through centuries, food has been recognized as important for human beings in health and disease. The history of man has been to a large extent  struggle to obtain food.  Until the turn of the  19th century  the  science  of nutrition  had  a limited range. Protein, carbohydrate andfat had been recognized early in the 19th century as energy-yielding foods and much    attention was paid to their metabolism  and  contribution to energy requirements. The discovery of vitamins at the turn of the 20th century “rediscovered" the   science of nutrition. Between the two World Wars, research on protein gained   momentum. By about 1950, all the vitamins and essential amino acids had   been discovered. Nutrition gained recognition as a scientific discipline, with roots in physiology and biochemistry. In fact nutrition was regarded as a branch of physiology.

Great advances have been made during the past 50 years in knowledge of nutrition and in the practical application af that  knowledge.   Specific   nutritional diseases were identified and technologies developed to control them, as for example, protein energy malnutrition, endemic goitre, nutritional anaemia, nutritional blindness and diarrhoeal diseases.

RELATION OF NUTRITION TO HEALTH

http://www.nutrition.com.sg/he/hepyr.asp

Good nutrition is a basic component of health. The relation of nutrition to health may be seen from the following view points:

Growth and development: Good nutrition is essential for the attainment of normal growth and development. Not only physical growth and development, but also the intellectual development, learning and behaviour are affected by malnutrition. Malnutrition during pregnancy may affect the foetus resulting in still-birth, premature birth and "small-for dates" babies. Malnutrition during early childhood delays physical and   mental growth; such children are slow in passing their "milestones", and are slow learners in school. Good nutrition is also essential in adult life for the maintenance of optimum health and efficiency. In short, nutrition affects human health from birth till death.

Specific deficiency: Malnutrition is directly responsible for certain specific nutritional deficiency diseases. The commonly reported ones in India are kwashiorkor, marasmus, blindness due to vitamin A  deficiency, anaemia, beriberi, goitre, etc. Good nutrition therefore   is essential for the prevention of specific nutritional deficiency diseases and promotion of health.

     Resistance to infection:

Malnutrition predisposes to infections like tuberculosis. It also influences the course and out-come of many a clinical disorder. Infection, in turn, may aggravate malnutrition by affecting the food intake, absorption and metabolism.

Mortality and morbidity:

The indirect effects of malnutrition on the community are even more striking - a high general death rate, high infant mortality rate, high sickness rate and a lower Expectation of life. Over-nutrition, which is another form of malnutrition is responsible for obesity, diabetes, hypertension, cardiovascular and renal disease, disorders of the liver and gall bladder. More recent reports suggest that diet perhaps plays an important role in certain types of gastro-intestinal cancers. It is now quite well accepted that diet and certain diseases are interrelated.

   Nutrition as a science can be regarded as the study of six main categories of food components: protein, carbohydrate, fat, minerals, vitamins, and water. The first three categories -protein, carbohydrate, and fat — are the only ones that provide calories. Protein provides 4 Calories/gm, as does carbohydrate. Fat provides slightly more than twice as much — 9 Calories/gm.vitamins and minerals.htm

Although minerals and vitamins provide no calories, they function in the many metabolic processes whereby one obtains and utilizes energy from foods and builds and then maintains body tissues. Minerals also function as vital constituents of many body tissues. Iron is a necessary component of hemo­globin, myoglobin, and the cytochromes, and calcium and fluoride are required for sound teeth and bones.

 The amount of water needed by every individual generally varies depending upon the outside temperature or the extent up to which the human body is subjected to the manual labour. This rise of temperature and humidity of air increases the necessity for intake of water. An insufficient intake of water leads to creation of disturbance in circulation, of heat regulation mechanism and the retention of products of metabolism. On the other hand, abundant intake of drinking water promotes  the circulation of fluid and increases the activity of kidneys with free secretion of urine. It is estimated that about 80 oz (2.27 litres) of water enters the body daily as such or as a part of cooked food, beverages etc. Out of which 48-64 oz. (1.37- 1.81 litres) is excreted daily in urine, sweat etc.

Some important uses of water are:

- As a solvent for transportation of nutrients in the body.

- It   helps   regulating   body   temperature through evaporation from lungs and skin.

- As an aid in removing wastes of metabolism in the urine.

- As an aid in functions like osmosis.

It is possible to allocate five groups of diseases, that is direct or mediate related with nutrition:

1. Alimentary disease, illness caused by deficiency or surplus of components of nutrition.

2. The secondary illnesses of insufficiency or excessive nutrition, which is developed as complication on a background of wearisome illnesses (surgical, infectious, oncology and others.)

3. Disease of multifactor nature that very much frequently develops on a background of genetic predilection, for example, atherosclerosis, gout, idiopathic hypertensia, oncological diseases etc.  

4. Disease, which are transferred by a nutritional way (some infections and helminths, alimentary poisonings).

5. Alimentary intolerance - atypical reaction to nutrition, for example alimentary allergy, idiosyncrasy.  Fats.

FUNCTIONS OF FOOD:

The main functions of food are:-       

1. Provision of energy - It provides fhe body fuels or energy foods, which on oxidation supply heat and energy. Even while at bed rest, some energy is being expended on respiratory, circulatory, and other body processes.

2. Body building and repair - It provides the material needed for growth  and upkeep of the body. Even after growth isstopped, the body continues to change throughout life. Tissues are continually wearing out and these must be changed or repaired.

3. Maintenance and regulation of tissue functions - It provides the materials which regulate and maintain body functions and processes. They regulate the way, in which various parts of the body act and protect the body from disease

On the basis of the above functions foods have been classified as :

(1) Energy-yielding foods: These are foods rich in carbohydrate and fat, e.g., rice, wheat, potatoes, sugar, fats and oils.

(2) Body building foods: These are foods rich in protein, e.g., milk, eggs, meat, liver, fish, pulses, oilseed cakes.

(3) Protective foods: These are foods rich in vitamins, minerals and proteins, e.g., milk, green leafy vegetables. Protective foods are so called because they protect the body against infection, disease and ill health.

A balanced diet must contain foods from the above three groups.

Balanced diet is one, which will meet a person's caloric need and contain all nutrients, particularly proteins, and vitamins. In addition, the food should satisfy the taste and desire of a person and should have enough roughage to promote the peristalsis. Balanced diet should have 50-60 % carbohydrates 30-35 % fats and 10-15 % proteins with necessary vitamins and minerals.

1. Conformity of entering energy to energy losses.

2. Conformity of chemical structure of alimentary substances to physiological needs of an organism.

3. The maximal variety of a ration.

4. Keeping of an optimum regimen of nutrition.

http://www.illumine.co.uk/course-fit-healthy-nutrition.htm

NUTRIENTS

Nutrients are organic and inorganic complexes contained in food. There are about 50 different nutrients which are normally supplied through the foods we eat. Each nutrient has specific functions in the body. Most natural foods contain more than one nutrient. These may be divided into :

(i) Macronutrients: These are proteins, fats and carbohydrates which are   often   called   "proximate   principles" because they form the main bulk of food.

 (ii) Micronutrients : These are vitamins and minerals. They are called micronutrients because they are required in small amounts which may vary from a fraction of a milligram to several grams.

A short review of basic facts about these nutrients is given below.

Animal Foods

These are, for example, e.g. meat, fish, eggs milk and milk products.

Meat

Characteristics of Good Meat

1. It has marbelled appearance due to fat and is acidic.

2. It is firm and elastic to touch.

3. No oedema or bad odour.

4. It is dry on surface and does not shrink much on cooking.

Meat of Unsound Quality

1. It is soft, moist and pale.

2. Reaction is alkaline and has putrefied odour.

Following are some of the diseases produced by consumption of unsound meat.

1. Tuberculosis: Tuberculosis is common in cattle but rare in sheep and goats. Usually, lymphatic glands, lungs, and liver are affected, but not the muscles. Howevr, flesh of tubercular animal should always be condemned.

2. Food poisoning may be caused by tinned meat. Such tins should have no dents and their ends should be concave and not convex. On opening, air should rush out and contents should not be discoloured.

3. Cysticercosis: Embryos of tape-worms inhabit the muscle of pigs, ox, etc and such a meat when ingested causes tape worm infection. However, embryos are killed, if such a meat is properly cooked.

4. Trichenella spiralis: Embryos are usually encysted in pig meat.

5. Actinomycosis through ox-meat especially in damp climate. The affected portions should be condemned.

6. Liver flukes is common in liver of sheep. Cooking always kills the parasites.

Depending on quality the food-stuff can be divided on such groups:

1. Products of high quality - the products which may be used without restrictions.

2. Non-standard. The products, which have the certain deviations from requirements of state standards or specifications, but it does not interfere to their realization (for example, chicken eggs of mass less 40g etc.).

3. Conditionally suitable. It is products, which can be used after additional processing.

4. Substitutes (ersatz). The products with reduced value as natural substitutes, for example, barley and acorn coffee. They are allowed to realization, provided that the consumer would be informed, what kind product is offered to him.

5. Food Adulteration  It is products, in which premeditatedly qualitative structure are changed to hide the certain disadvantages or sings of decay. Such products are forbidden to realize to the population.

Some of the common practices in different country include

Rice and wheat: There are mixed with stone chips and gravel to incrase the bulk.

Flour: Wheat flour is mixed with soap stone powder and cheaper flours such as maize flour;

Milk: Removal of fat and addition of water, starch and skimmed milk, milk powder etc. are the common types of milk adulteration

Butter is adulterated with other animal fats in Western countries and in India by other vegetable oils.

Miscellaneous : Tea leaves are adulterated with old tea leaves, leather and saw dust. Coffee is adulterated with chicory. Honey is adulterated with sugar or jaggery and boiled with empty beehives. Papaya seeds are mixed with pepper. Powdered condiments and spices often contain an assortment of innumerable substances including horse dung and brick powder.

Some forms of adulteration may not be very dangerous e.g., addition of water to milk, cheap edible oils to expensive ones, cheap flours to expensive ones etc. However, they may considerably reduce the nutritive value, contaminate the food (e.g.. water to milk) and add toxins to the food (e.g., kesari dal flour to other flour and adulteration of edible oils with argemone oil and white mineral-oil, use of non-permitted colours in sweets and cordials, and that of lead chromate for spices etc.

The Prevention of Food Adulteration Act, 1954 (with some amendments in 1963) aims to prevent adulteration and sale of substandard foods. The rules prescribe standards to which various articles of food must conform, and also lay down what pre­servatives, colouring agents, antioxidants, emulsifying agents etc. are to be permitted.

Low-quality. The products concern to those, which are not suitable to nutrition in any way, that is, which have the expressed signs of decay (rotting, etc.).

 High quality of food-stuff have to be established by organoleptic and laboratory methods.

Fortification and Enrichment.

Addition of one or more dietary essentials to some foods in amounts which make the total content greater than that found in that particular food in its natural state is known as Fortification. It also includes addition of one or more dietary essentials which original food does not contain in its natural state. Enrichment means addition of dietary essentials to a food to restore the total content of the former. Some of the examples of fortification and enrichment are as follows:

Addition of Vit. A and D to milk,

addition of potassium iodate to common salt for endemic goitre areas,

addition of iron and calcium to common salt is being considered by the Government of India,

addition of synthetic aminoacids foods e.g., lysine to wheat flour etc.

Supplementary Foods.

A number of cheap supplementary foods are being formulated, which can provide nutrients at low cost, as a supplement to the usual diet.

Food Additives. Food additives are non-nutritious substances which are added intentionally to food, generally, in small quantities to improve its appearance, flavour, texture or storages properties.

Food additives are generally used as food colours, antimicrobials, anti-oxidants and as stabilising, bleaching and maturing agents. Their use for a number of techinical processes such as the maintenance of the nutritive quality of food, enhancement of keeping quality, making food attractive to the consumers and providing essential aids to food processing, is well recognised. However, their abuse is creating serious public health problems, because they are sometimes used to deceive the consumer by disguising the faulty handling and processing techniques. Several food additives are under controversy about their safety; and some are dangerous to health, which are quite often used in spite of not being permitted by law.

Some of the examples of food additives:

Addition of colours in sweets,

addition of alum to bread to improve its whiteness,

addition of salts of copper and lead to confectionary to give bright colours,

addition of red lead to cheese to increase its attactiveness,

addition of ferrous sul­phate to beer to strengthen its taste,

addition ol salt, nitre, calcium sulphate to preserve food and so on.

 

 

Animal Foods

 These include meat of any kind, fish, eggs, milk and its preparations etc.

1. Meat. It consists of muscle-fibres held together by connective tissues. The fibres of meat contain muscle plasma or muscle-juice. It contains 1 to 2 % salts which are chiefly chlorides and phosphates of potash. The proteins of meat which are present to the tune of about 17 to 20 % are myosin, muscle-albumen and haemoglobin. Fat (10 to 20 %) is often embedded in the connective tissues of meat.

Inspection of Meat. Anti-mortem inspection of animals should be done, wherever possible and the animals should be rejected, if they appear to be ill. The carcase should be inspected after slaughtering whole and also part by part and subsequently organ by organ. Mediastinal and bronchial lymphatic glands should be examined for evidence of tuberculosis. If the animal has suffered from jaundice, the flesh will have a yellow tinge.

Characteristics of Good Meat. The muscle fibres are of deep red colour and marbelled with fat. The reaction should be acidic. It should be firm, elastic to touch. It should have little or no odour as diseased meat emits odour of putrefaction or sickly smell. The fat should be firm and of whitish or yellowish grey colour. Lymphatic glands should be free from all diseases. Any diseased condition, i.e., cysts of tapeworms etc., should not be present.

Unsound Meat. It is that meat which has begun to putrefy. It becomes soft, moist, pale and often has greenish colour. The reaction becomes alkaline and odour of putrefaction may commence in the deeper part of the meat especially near the bones and so the odour may not be apparent from the outer surface. Therefore, in case of suspected meat, it is advisable to push an iron skewer deep into the meat; pull it out and smell it. The smell should be sweet and agreeable. The juice should be reddish and acidic, since alkalinity is an indication of decomposition. Putrified meat is extremely dangerous, as poisonous substances get developed, which introduce sudden and fatal illnesses due to ptomaine poisoning.

Diseased Meat. The flesh of animals killed by accident, lightning or those who happen to be suffering from diseases like anthrax, rabies, glanders, general tuberculosis etc., should be condemned. The diseased meat should be condemned and prevented from sending into the market. The chief diseases of animals are:

(1) Tuberculosis. It is practically common in cattle and pigs in the European countries. It is rare in sheep, goats and other cattle in India. It is practically always present in lymphatic glands of the diseased animals. Muscles practically never get affected and it is extremely doubtful if eating meat, so affected, spreads tuberculosis.

In tubercular animals when disease is generalised, the whole carcase should be condemned as unfit for human consumption since that meat happens to be poor in quality and unwholesome even though it may not convey tuberculosis to consumers.

(2) Cysticercus. This is the name given to the embryos of tapeworms which live in muscles of animals especially oxen and pigs, where they produce little greyish bladders or vesicles called cysts. In these tiny cysts are contained the heads of tapeworms and when anybody happens to eat such a meat these cysts break into his stomach and let loose the heads, which pass through the intestines, get fixed to the intestinal wall and ultimately grow into full grown tapeworms which may be several metres long. If meat is properly cooked the tiny embryos are killed due to heat and in that case, they may not do much harm. All such infected meats should be condemned.

(3) Trichinella Spiralis. It reaches man on account of eating insufficiently cooked flesh of a pig having worms in encysted form. In pork and ham these may be seen as white spots, large enough to be visible to the naked eye. The adult worm lives in crypts in mucosa of small intestines. It gives rise to embryos which enter circulation and are carried into the musulature of host, where they encyst. The muscles most often affected are those of the diaphragm, larynx, tongue and abdomen. Encysted larvae remain alive for years. When these cysts are found in the slaughtered animals, the whole carcase should be condemned. Serious illness may result from Trichinosis, whose symptoms are pain, nausea, rapid pulse, fever, irregularity of bowels and death occurring due to peritonitis.

(4) Actinomycosis or Ray Fungus. In this case infectious agent is Actinomyces israelii or A-bovis. It is now recognised as a parasite, which occurs in the meat of oxen. It may affect other cattle especially calves, pigs, horses, sheep etc. It occurs particularly in wet weather. The tongue, jaws and lungs are commonly affected. The post-mortem appearances closely resemble tuberculosis. In this case only the affected parts are condemned.

(5) Distomum Hepaticum of Liver Flukes. They resemble flat fish, each of them being 2-4 cm. Long and 1 cm. wide. They are brownish in colour and are found covered with little bristles. They are very common in sheep in India. The parasites are found in the liver, bile ducts and give rise to a disease called the rot. As cooking always kills the flukes, only a few cases of disease from this parasite are known to occur in man.

 

Preventive Measures

1. Compulsory inspection of animals before slaughtering and also of carcasses by veterinary experts at slaughter houses, which should be public owned.

2. The slaughter houses should be pucca built with proper drainage and free water supply for cleaning. These should be situated away from habitation and no dogs, etc. should be allowed in the vicinity.

3. Persons suffering from infectious diseases should not be al­lowed to handle meat.

4. Meat at shops must be properly protected from flies.

5. Vehicles for transporting meat must be clean.

Fish

It is highly nutritive and easily digested. It contains all vitamins (except Vit. C) and has high calcium value. Its liver is rich in Vit. A and D. Fresh fish has bright pink gills and firm shiny scales with prominent eyes. It is firm and elastic with no bad odour.

Fish is considered as 'brain food'. It contains omegas, a polyun-saturated fatty acid, which lowers blood pressure, relieves arthritis inflammation and aids brain development. Fish oils tend to lower blood cholesterol and triglycerides.

Fish poisoning may occur by toxin produced by Cl. botulinum and decomposed fish may cause protamine poisoning. Shell fish from polluted water contains toxins.

It is easily digested and is assimiable. It has a high nutritive value, though not so stimulating as meat, but generally it is less rich in fats and contains more calcium than ordinary meat. It has all the vitamins except vitamin C. Fish liver is a rich source of vitamins A and D. Sea fish is a rich source of iodine.

 

There are two kinds of fish: Lean fish. It consists of small fibres and contains fat below 2 %. It is easily digested. Fat fish. It consists of medium or large fibres with fat content of 2.5% or more. It is somewhat difficult to digest.

There is no recommended limit on how many eggs people should eat. Eggs are a good choice as part of a healthy balanced diet. But remember that it's a good idea to eat as varied a diet as possible. This means we should be trying to eat a variety of foods each week to get the wide range of nutrients we need.

Eggs are a good source of:

·                     protein

·                     vitamin D

·                     vitamin A

·                     vitamin B2

·                     iodine

Eggs can make a really healthy meal. Why not try one of these for your breakfast, lunch or evening meal:

·                     Spanish omelettes with chunks of cooked potatoes (you could use leftover potatoes from last night's dinner) and onions served with steamed veg or a salad. All sorts of veg will work in the omelette – sweet potato, peppers, spring onions and mushrooms are all good choices.

·                     Poached egg and baked beans (choose reduced salt and sugar versions if you can) served on thick sliced toast makes a great brunch – you could serve it with grilled tomatoes or mushrooms.

·                     Scrambled eggs on thick slices of brown toast, add some spring onions or mushrooms and serve with grilled tomatoes.

·                     Boiled eggs chopped into a summer salad. If you include salad leaves, new potatoes, green beans, red onion, olives, boiled egg and some tuna, you will have yourself a filling salad niçoise.

But remember that quiches and flans can be high in fat and salt, so try not to eat these too often. The pastry is high in fat, and quiches and flans often contain cream and cheese, and sometimes bacon too, all of which add to the saturated fat and salt content.  If you are making your own quiche or flan, go easy on the cream and cheese – if you us a strong flavoured cheese you will only need to use a small amount. And add some vegetables such as broccoli, peppers and tomatoes.Fried eggs are higher in fat than boiled, poached or scrambled eggs, but there's nothing wrong with having them occasionally. If you do want a fried egg, use an oil that is high in unsaturated fat such as sunflower oil. It's a good idea to drain off as much of the oil as you can and it will also help to put the egg on some kitchen paper before putting it on your plate.

Characteristics of Good Fish

 A fish should have bright pink gills, firm glistening scales and prominent lustrous eyes. It should have a bright and glistening skin with a covering of clear slippery mucous. It should be free from any disagreeable odour. When held flat on hand by head, the tail should not droop. It should not feel soft or leave an impression or depressed mark when pressed by a finger. Its skin should be intact and scales should not be easily detachable. If not eviscerated a sound dead fish sinks in water.

A decaying fish has dull grey sunken eyes, grey muddy gills, the scales become detached and have a characteristic putrefying smell. It may cause ptomaine poisoning. It floats in water with belly up, A putrefying fish shows dark blood or dark tarry liquid on cutting and its body becomes flaccid. A large tapeworm called Dibothriocephaluslatus is conveyed to man by eating insufficiently cooked fish. Fish poisoning may occur due to toxins produced by Cl. botulinus. Its decomposition may give rise to ptomaine poisoning. It may be found that some per­sons possess idiosyncracies especially to muscles, which are said to cause poisoning by mytilo toxin. The chief symptoms produced are dyspepsia, urticaria, swelling of tongue, numbness of limbs, weak irregular pulse etc.

Tinned Meat and Fish.

They are commonly used. It is very essential to see that meat and fish in tins are wholesome, not old and putrefied. The tins should be carefully examined before consumption in the following ways:

(1) On Inspection. There should be no indentations, holes, soldering defects or signs of gross ill usage. It should not be rusty. It should have concave ends and not be bulging or blowing out indicating putrefaction and formation of hydrogen gas in acidic medium. A collapsed tin signifies too much vacuum. All leaking and non-airtight tins should be discarded.

(2)On Palpation. If putrefaction has set in and gas has formed it gives a springy feel with a sense of resistance. It so happens particularly, when air has entered into the tin through a leaking hole and the vacuum is lost.

(3)On Percussion. If the note is tympanitic, it indicates unsound tin due to formation of gas, while a dull note indicates a sound tin.

(4)On Shaking. A sound tin will produce no sound, but if the contents are putrefied and are partially liquid then a loose sloppy sound will be detected.

 

 

Eggs

An average hen's egg weighs about 60 gms, with 2/3rd as white and 1/3 as yolk. It has all the important nutrients except carbohydrates. The egg white is mostly egg albumin; while the yolk contains fat, lecithin, phosphorus, calcium and iron. The egg can be preserved by making their shells air tight by immersing them in lime-water or by coating them with oil or sodium silicate a process of glazing. The test for freshness of an egg: put it in 10% common salt solution; good eggs sink while stale ones will float.

Eggs and cholesterol

Eggs contain cholesterol and high cholesterol levels in our blood increases our risk of heart disease. However, the cholesterol we get from our food – and this includes eggs – has less effect on the amount of cholesterol in our blood than the amount of saturated fat we eat. So, if you are eating a balanced diet you only need to cut down on eggs if you have been told to do so by your GP or dietitian. If your GP has told you to watch your cholesterol levels, your priority should be cutting down on saturated fats.

 

Milk

It is an ideal food containing nearly all the nutrients of well balanced diet. It is the best particularly for infants, children, and lactating mothers. It contains milk sugar (Lactose), proteins, fat, vitamins, clacium pJzosphorus, chloride, potassium and sodium but is poor in iron.

Composition of Milk

Source of      Milk        Proteins     Fats      Lactose    Minerals     Water

Human                               2.4        3.1        6.2       0.8                     88.0

 Cow                                  3.5        3.7       4.8        0.7                    87.3

 Goat                                 3.6       4.6       42       0.7                         86.9

Buffalo                             4.8        7.8       45       0.8                       82.1

In proteins, there is more of caseinogen in cow's and buffalo's milk; while there is more of lactalbumin in human and goat's milk. Fat contents in human and cow's milk are nearly the same, while in goat's and buffallo's milk they are more.

Methods of Preservation of Milk

1. Boiling is very common method in India. It is quite simple and satisfactory as all pathogens are killed.

2. Sterilizationby raising the temperature to 100°C for 15 minutes in a closed sterilised container.

3. Drying: Milk is passed over heated rollers and converted to milk powder. Being easily digestable, it is an ideal baby-food. But now this milk powder as baby food is being condemned.

4. Condensed milk: Milk is gradually heated under pressure to reduce water contents to about 1 /4th of its original volume and then packed in sealed tin. The varieties are full cream or skimmed milk both in sweetened and unsweetened forms.

5. Addition of antiseptic e.g., boric acid, sulphurous acid, N202. This is however not used in practice.

6. Pasteurisation is the best and most successful practical method, as it ensures destruction of pathogenic organisms by heat without altering the physical character of the milk.

Pasteurisation

The milk is heated to 145°-150°F, for half an hour and then rapidly cooled to 55°F. This retains the enzymes, taste, flavour and nutrients of milk. The milk is kept free of contamination from the time of heating till its delivery to consumers. Two common methods of pas­teurisation are:

1. Holder's method: Milk is heated in cylindrical tanks with steam passed in water jackets surrounding it to 145°-150°F for 30 minutes and then cooled rapidity to 55°F by passing cold water through the jackets.

2. Flash method or high temperature short time (H. T.S. T.) method:

Here milk is heated 1600-1700F for a few seconds and then quickly cooled to 50°F. Holder's method is usually considered more satisfac­tory although H.T.S.T. method is being perfected.

For a satisfactory town milk scheme, the following points should be considered.

1. Improvement of cattle breed, free of diseases.

2. Sanitary cattle sheds with efficient drainage and enough water supply to ensure proper cleaning.

3. Milkmen should be free from infectious diseases and trained to observe scrupulous hygienic precautions while milking and han­dling the milk, which should be in clean containers and protected from flies.

4. The milk should be first chilled, if far away from pasteurisation plants and then transported, pasteurised and sealed in bottles.

5. For practical observance of above mentioned measures, there should be proper legislative control by public health department.

Test for pasteurisation: To test for adequte pasteurisation process, following tests are carried out:

1. Phosffhatase test: Phosphatase (an enzyme) is normally present in milk and is inactivated during pasteurization. The presence of phos-phatase in the milk indicates inadequate pasteurisation. This test is useful in Holder's method but is not so reliable in H.T.S.T. method, in which phosphatase may not be completely inactivated, in spite of efficient pasteurisation.

2. Coliform bacilli test: Coliform bacilli present in milk are destroyed by pasteurisation. Their presence in milk means either inadequate pasteurisation or recon lamination of milk at some later stages.

Milk-borne Diseases

These are tuberculosis, typhoid, paratyphoid, dy sentry, cholera, diphtheria, sore throat and undulant fever, infectious hepatitis, poliomyelitis, etc.

Other Preparations of Milk

Dahi (curd) prepared by boiling, wanning the milk and adding a little curd. The fermentation is by lactic and bulgaris bacilli. It is easily digested.

Butter milk is made by churning curdled milk and removing but­ter.

Butter contains fat (80-90%), lactose, salts, traces of casein and arom-tic principle. It is very nutritious and easily digestible among all fats.

Ghee: It is clarified butter and largely used in tropical countries in preference to butter, as it can be preserved for longer period.

Cheese is a concentrated protein food and has about 30% fat and 28% casein.

Skimmed milk and cream are made with centrifugal machine. Cream is removed and skimmed milk is left over.

Composition of meat, Fish and Eggs (g/100g)

 

Protein

Fat

Minerals

Meat (goat)

18,5

13,3

1,3

Fish

21,5

1,6

2,0

Egg (hen’s)

13,3

13,3

1,0

 

Vegetable Foods

These are cereals, pulses, roots, green vegetables, fruits and nuts.

Cereals are mainly carbohydrates and also contain minerals (P, Cal, Mg, K, Fe). Wheat and rice are the main cereals. A good wheat flour must have at least 8% gluten. Usually it has 60-70% car­bohydrates and 10-12% gluten.

Rice is poor in proteins, fat and minerals, but very rich in starch.

Barley is rich in proteins and minerals.

Maize is rich in proteins, carbohydrates and fatty matter.

Oat is rich in protein and carbohydrates.

Bajra is rich in protein and carbohydrates.

Pulses are nitrogenous substances. Vegetable protein is legumin (24-25%). Minerals are potassium, calcium and sulphur. Pulses also contain carbohydrates but are deficient in fats.

Roots and tubers ^.potatoes, beet-roots, carrots etc,

Vegetables arc usually a rich source of minerals and vitamins.

Fruits: These may be food fruits or fruits of flavour fruits.

Flavour fruits e.g., orange, lemon. These quench thirst and are rich in Vit C and minerals.

Nuts like ground nut are very rich in proteins.

In general, vegetable foods form more bulk and have less protein. If proportion of vegetable in food is very high, the bowels get dis­tended and there is more muscular effort on intestine and more blood and energy required for the purpose.

Beverages and condiments are substances which enable food to be taken with pleasure and relish and aid digestion. These are water (universal beverage) tea/ coffee, fermented drinks, spices, etc.

 

Metabolism

It is process of chemical changes occurring in the body after diges­tion and absorption of food nutrients, their utilisation by body tissue, for processes of synthesis (anabolism) and for those of breakdown (catabolism).

Energy for basal metabolism: This is the energy necessary for maintaining body temperature and for activity of heart and vital organs, when body is at complete rest The basal metabolic rate (BMR) of an average adult is 1500-1700 Cal/day and is dependent on body weight, age, sex, state of health, mental state and the environments.

Food Calorie

A calorie is defined as the amount of heat required to raise the temperature of 1 gm of water through 1°C from 14.5°C to 15.5°C.

Unit of Food (Cal.) 1 - 1,000 small calories.

·        1 gm. of carbohydrate produces    4.1 Cal.

·        1 gm. of fat produces             9.3 Cal.

·        1 gm. of protein produces          4.1 Cal.

Family co-efficient: It is relative energy requirement of various members of household in terms of such units expressed as mean value taken as one:

So for adult male unit is            1

For adult female unit is          0.9

For pregnant women unit is      1.2

For nursing mother unit is        1.5

BALANCED DIET

Balanced diet is one, which will meet a person's caloric need and contain all nutrients, particularly proteins, and vitamins. In addition, the food should satisfy the taste and desire of a person and should have enough roughage to promote the peristalsis. Balanced diet should have 50-60% carbohydrates 30-35% f-»ts and 10-15% proteins with necessary vitamins and minerals.

PROTEINS

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The word "protein" means that which is of first importance. Indeed they are of the greatest importance in human nutrition. Proteins are composed of carbon, hydrogen, oxygen, nitrogen and sulphur in varying amounts. Some proteins also contain phosphorus and iron and occasionally other elements. Proteins differ from carbohydrate and fat in the respect that they contain nitrogen. Proteins are made up of simpler substances, called amino acids. These are the building blocks of protein.

Some 22 amino acids are stated to be needed by the human body, out of which eight are called "essential". The essential amino acids are: (1) Isoleucine (2) leucine (3) lysine (4) methionine (5) phenylalanine (6) threonine (7) tryptophane; and (8) valine. These are called "essential" because the body cannot synthesize them in sufficient quantity, and therefore they must be obtained from the food we eat.

Functions :

Proteins are needed by the body: -

ü                 For growth and development: They furnish the building material, i.e. the amino   acids  from which  the  body proteins are synthesized.

ü                 For repair of body tissues and their maintenance: It has been shown that the   body   proteins   are   constantly being broken down; they have to be replaced   for   which   fresh   protein intake is required.

ü                 For synthesis of antibodies, enzymes and hormones: Antibodies, enzymes and hormones contain protein. The body   requires   protein   to   produce them.

ü                 Proteins can also furnish energy to the body, but generally the body depends for its energy on carbohydrates and fats rather than proteins.

Sources:

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There are two main dietary sources of protein: -

Animal  sources:   milk,   eggs,   meat, fish, etc.

Plant sources: Pulses, cereals, nuts, etc.

A mixed diet containing both animal and vegetable proteins meets with the needs of essential amino acids required by the body. Each gm. of protein on oxidation yields 4.1 calories of heat.

Protein rich foods are milk, lean meat, fish, poultry, eggs, nuts, legumes, beans and pulses.

The protein content of some foods is given in Table 2.

Protein requirements

It is customary to express protein requirements in terms of body weight. Doctors recommended 1,0 g. protein/kg, body weight for an adult. Daily allowances recommended by the ICMR for various population groups are given in Table 16 (see page 113).

Effects of protein deficiency:

The effects of protein deficiency may summarised as below.

During pregnancy: Still  birth,   low birth weight, anaemia

Infancy     and     early     childhood:  Marasmus,     kwashiorkor,     mental retardation,    stunted    growth    and development

Adults: Loss of weight, underweight, poor musculature, anaemia, increased susceptibility to infection, frequent loose stools, general lethargy, incapacity to sustained work, delay in wound healing, cirrhosis of liver, oedema, ascitis, etc.

 

FATS OR HYDROCARBONS.

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 Fats are composed chemically of carbon, hydrogen and oxygen, only in different proportion than they are contained in car­bohydrates. There is less of oxygen in fats than in carbohydrates. The true fats are glycerides of fatty acids and butter, ghee, vegetable hydrogenated oil, animal fat etc. are the examples of various fats com­monly used by people. Fats are a form of con­centrated food and like carbohydrates, they are used as body fuels for the production of heat and energy. As fats are not soluble in water, the process of digestion changes the fat into an emulsion form for their ab­sorption into the body. Liquid fats and those which melt at body temperature are somewhat better digested than those which are much harder. A fat-rich diet slows the process of digestion and gives a feeling of heaviness and fulness. In the body, the fat which cannot be immediately used, is partly deposited as adipose tissue under the skin and partly unabsorbed passes out with the faeces. Excessive intake of animal fats increases blood cholesterol level, which may be a contributory factor for the development of heart diseases. Certain unsaturated fatty acids in fats are considered essential for health. Fat soluble vitamins are present in animal fats. Fat diminishes protein metabolism and therefore is called protein sparing food. The daily diet of an adult should include 45 to 60 gms. of fat.

Sterols. These are substances which resemble fats only in their physical properties and solubilities. Ergosterol and cholesterol are the examples of this group and are associated in the body in the bile, nervous tissue and blood corpuscles.

Some fats such as groundnut oil, gingely oil are liquid at  room temperature: some fats such as ghee and butter are solid at room temperature. Fats are again classified into saturated and unsaturated fats. In general, animal fats are "saturated" fats; vegetable oils and fats are "unsaturated" fats. Current researches indicate that excessive intake of saturated  fats (i.e., animal fats) is harmful to the body. Cardiovascular disease which is a frequent disease in the western countries and among the well-to-do people in India is attributed to excessive consumption of saturated fats.

Fats


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Most people know that we should be cutting down on fat. But did you know it's even more important to try to replace the saturated fat we eat with unsaturated fat? Read on to find out how.

We need some fat


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It's important to have some fat in our diet because fat helps the body absorb some vitamins, it's a good source of energy and a source of the essential fatty acids that the body can't make itself. But having a lot of fat makes it easy to have more energy than we need, which means we might be more likely to put on weight. So if you want to eat healthily and keep a healthy weight, look out for lower fat alternatives wherever possible and try to eat fatty foods only occasionally.

Different sorts of fats

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Although it's important to try to eat less fat, we also need to think about the types of fat we are eating. We should be cutting down on food that is high in saturated fat or trans fats or replacing these foods with ones that are high in unsaturated fat instead. We should also be having more omega 3 fatty acids, which are found in oily fish.

Saturated fats

Having too much saturated fat can increase the amount of cholesterol in the blood, which increases the chance of developing heart disease.
These are all high in saturated fat:

·                     meat products, meat pies, sausages

·                     hard cheese

·                     butter and lard

·                     pastry

·                     cakes and biscuits

·                     cream, soured cream and crème fraîche

·                     coconut oil, coconut cream or palm oil

 

Trans fats

Trans fats have a similar effect on blood cholesterol as saturated fats, they raise the type of cholesterol in the blood that increases the risk of heart disease. Some evidence suggests that the effects of these trans fats may be worse than saturated fats. However, most people eat a lot more saturated fat than trans fats. Trans fats can be formed when liquid vegetable oils are turned into solid fats through the process of hydrogenation. Foods containing hydrogenated vegetable oil, which must be listed in the ingredients list on the label, might also contain trans fats. Trans fats are often found in these types of foods:

·                     biscuits and cakes

·                     fast food

·                     pastry

·                     some margarines

These sorts of food are usually high in saturated fat, sugar and salt so if you are trying to eat a healthy diet, you should try to keep these to a minimum. Trans fats are also found naturally at very low levels in foods such as dairy products, beef and lamb.

Unsaturated fats

Unsaturated fats can be a healthy choice. They don't raise cholesterol in the same way as saturated fats. These types of fats provide us with the essential fatty acids that the body needs. These include the unsaturated fats found in oily fish, which may help prevent heart disease. These are all high in unsaturated fat:

·                     oily fish

·                     avocados

·                     nuts and seeds

·                     sunflower, rapeseed and olive oil and spreads

·                     vegetable oils

If you want to make a healthy choice, try to have more unsaturated fats and less saturated fats, this means you could choose:

·                     oily fish instead of sausages or a meat pie

·                     use unsaturated oils such as olive, sunflower or rapeseed oils instead of butter, lard and ghee in cooking

·                     snack on some unsalted nuts instead of a biscuit

·                     make your mashed potato with olive oil and garlic instead of butter and milk for a change

·                     choose a fat spread that is high in unsaturates instead of butter

More on a healthy heart

 

What's a lot and what's a little?

If you want to try to cut down on fat, or you just want to watch how much fat you are eating, you can compare the labels of different food products and choose those with less total fat and less saturated fat. You will see figures for the fat content on many food labels and some foods will also give figures for saturated fat. Use the following as a guide to what is a lot and what is a little fat per 100g food. 20g fat or more per 100g is a lot of fat 5g saturates or more per 100g is a lot 3g fat or less per 100g is a little fat 1g saturates or less per 100g is a little fat If the amount of total fat is between 3g and 20g per 100g, this is a moderate amount of total fat. Between 1g and 5g of saturates is a moderate amount of saturated fat.

Tips for cutting down

Here are some practical suggestions to help you cut down on fat, especially saturated fat:

·                     Choose lean cuts of meat and trim off any visible fat.

·                     Grill, bake, poach or steam rather than frying and roasting so you don't need to add any extra fat.

·                     If you do choose something high in fat such as a meat pie, pick something low fat to go with it to make the meal lower in fat – for example you could have a baked potato instead of chips.

·                     When you're choosing a ready meal or buying another food product, compare the labels so you can pick those with less total fat or less saturated fat.

·                     Put some extra vegetables, beans or lentils in your casseroles and stews and a bit less meat.

·                     Measure oil for cooking with tablespoons rather than pouring it straight from a container.

·                     Have pies with only one crust rather than two – either a lid or a base – because pastry is very high in fat.

·                     When you're making sandwiches, try not using any butter or spread if the filling is moist enough. When you do use fat spread, go for a reduced-fat variety and choose one that is soft straight from the fridge so it's easier to spread thinly.

·                     Choose lower fat versions of dairy foods whenever you can. This means semi-skimmed or skimmed milk, reduced fat yoghurt, lower fat cheeses or very strong tasting cheese so you don't need to use as much.

·                     Instead of cream or soured cream try using yoghurt or fromage frais in recipes.

Omega 3 fatty acids

Oily fish is the best source of omega 3 fatty acids. These fatty acids have been shown to help protect against coronary heart disease.  Some omega 3 fatty acids are found in certain vegetable oils, such as linseed, flaxseed, walnut and rapeseed, but these aren't the same type of fatty acids as those found in fish. Recent evidence suggests that the type of fatty acids found in vegetable sources may not have the same benefits as those in fish.

Functions:

 Fats serve the following functions:

ü      Dietary fat is a concentrated source of energy. One gram of fat supplies 9 calories of energy. This is almost twice the number of calories derived weight for weight, from carbohydrate or protein.

ü      Fats are carriers of fat-soluble vitamins, e.g., vitamins A, D, E and K.

ü      Dietary   fat supplies "essential fatty   acids". Linoleic   acid, one of  the ssential fatty acids, prevents scaly skin formation. In general, essential fatty acids are needed for growth and maintenance of the integrity of the skin.

ü      The fat layer below the skin plays an important role in maintaining our body temperature.

ü      Fats  provide support  for many organs in the body such as heart, kidney, intestine etc.

ü      Foods containing fats are tasty.

Sources:

Dietary fats are derived from two main sources - animal and vegetable sources.

Animal   sources:   These are ghee, butter, fat of meat, fish oils, etc.

Vegetable sources: These are various vegetable oils such as groundnut, gingely, mustard, cottonseed, safflower (kardi) and coconut oil.

CARBOHYDRATES

Описание: Описание: Описание: Lactose is a disaccharide found in milk. It is pivotally composed of a molecule of β-D-galactose and a molecule of β-D-glucose bonded by a β1-4 glycosidic linkage.

They form the largest component of diet of most of the people and furnish most of the required energy. Starches and sugars are grpuped under this head. Wheat, rice, maize, barley, cereals, potatoes, sweet potatoes, turnips, root vegetables etc., are rich in starches, while sugarcane, beetroot and fruits contain the sugars. The original source of all starches and sugars is green plants. When plants have excessive sugar and they need to store it, as reserve supply of food, plant body is capable of changing its sugar into starch. Carbohydrates are abundantly present in food. All carbohydrates have to be changed into glucose and fructose before they can be absorbed into the body. 1 gm of sugar yields 4.1 calories of heat. Chemically carbohydrates are composed of carbon, hydrogen and oxygen as the name implies. Polysaccharides are various starches which are converted into two molecules saccharides i.e.> cane sugar, beet sugar, milk sugar and malt sugar. These on further digestion change into single molecule monosaccharides, glucose and fructose. The daily requirement of car­bohydrates varies from 50 to 60% of total energy intake.

The carbohydrates are chief sources of energy. Over half the energy requirements of the body are met with by carbohydrates. In the active muscles, the glacose is oxidised for the production of energy and warmth. Glucose which cannot be used imme­diately, is converted into glycogen and stored in the liver and muscles or converted into fat and stored under the skin.

Sources: Описание: Описание: Описание: Grain products are rich sources of complex carbohydrates

There are three main sources of carbohydrate:

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MINERAL SALTS

Vitamins and minerals.

These are essential for the main­tenance and growth of the body. They also maintain the normal osmotic pressure in the fluids and tissues of the body, besides playing an important part in the acid alkali regulation of the body. They are also required to make good the loss of salts excreted in urine and sweat. The alkali forming elements are calcium, potassium, sodium, iron and manganese. The acid forming elements are phosphorus, sulphur and chlorine.

The main functions of salts in the body are:

1.      To maintain tone of muscles, nerves and blood.

2.      To stimulate digestive secretions.

3.      To help general growth of the body.

4.      To    help    in    maintaining    acid    alkali equlilibrium.

5.      To maintain rigid structure of body such as bones, teeth etc.

In the human body there are at least 15-16 dif­ferent mineral elements and each has its own specific part to play.

The following mineral salts are, however, most important from nutrition point of view:

1.                  Calcium. It is the chief constituent of bones and teeth. It gives rigidity, strength to bones and hardness, shine to the teeth. It controls rhythmic activities of the heart and contractile muscles. It is essential for the coagulation of blood. It is required in much greater amount during the periods of pregnancy and lactation. Its daily requirement for an average adult is 1 gm. and for lactating mother 1.5 gms. Calcium metabolism is closely related to phosphorus and vitamin D. Its deficiency leads to poor development  of bones  and  teeth,  rickets,  osteomalacia, delayed blood coagulation, hyperplasia of parathyroid glands and low calcium tetany. The best sources of lime salts are milk, cheese, eggs, dark green leafy vegetables and dried fruits. The calcium of green vegetables is, however, not so easily absorbed as the calcium of milk.

2.                  Phosphorus. It is contained in every cell of the body. It is essential for the multiplication of cells and the growth of body. It works with calcium in bones and teeth. Its daily requirement in the diet is 1.5 gms. but mqre of it is required during pregnancy. Its deficiency is characterised by softening of bones, caries of teeth, stunted growth, changes in the reaction of blood and depression of vital processes. Its chief sources are cheese, yolk of eggs, oatmeal, almonds, nuts, peas, bones, whole wheat, liver, milk, potatoes etc. In cereals about 50 to 80% of phosphorus is present in the form of phytic acid, i.e., inositol hexosephosphoric acid.

3.                  Iron. It is the main constituent of haemoglobin of blood and nuclei of the cells. It acts as an oxygen carrier to the lungs and tissues and plays an important part in the oxidation and catalysis of enzymes. Its daily requirement is 25 mgms. But an adult woman needs more of iron to compensate for loss of blood in menstruation and also during pregnancy, lactation etc. An adult person has about 3-4 gms of iron out of which 2.4-2.7 gms. exist in the form of haemoglobin. Its deficiency causes anaemia. Its chief sources are liver, red meat, eggs, pulses, cereals, onion, green leafy vegetables, dry fruits, dates, figs, resins etc. Human milk contains 1 mg. of iron per litre.'

4. Iodine. It occurs in all the tissues and fluids of the body. It is an essential constituent of thyroid gland. Its iodine rich secretion thyroxin, regulates the metabolism. Its daily requirement is about 150 m.gms. This may be increased during puberty, pregnancy and menopause. Its deficiency causes goitre. Its chief sources are seafish, cod liver oil, yolk of eggs, onions and fresh vegetables. Iodised table salt is used to supply the iodine in endemic goitre areas. The minimum daily requirement of iodine for an adult person is 0.15 mg. to 0.30 mg.

5. Sodium Chloride. It occurs in all the tissues and fluids of the body. It maintains osmotic pressure in blood and other tissue fluids. It is essential for the maintenance of PH ion concentration. It is present in gastric juice and bile. Its daily requirement is 10 to 15 gms. Its deficiency leads to cramps, marked general weakness, mental lassitude, dyspnoea on exertion and heat exhaustion. These symptoms can be delayed or even prevented by drinking of water containing 0.25% of sodium chloride.

6.  Copper.   It   helps   in   the   formation   of haemoglobin of blood along with iron. Its daily requirement is 2 m. gms. for an adult.

7.  Chlorine. It is necessary to maintain the composition of blood and also in the formation of hydrochloric acid in the body. It is found in common salt, bananas, tomatoes, lettuce and green leafy vegetables.

VITAMINS

Vitamin and mineral ABCs

Vitamins and minerals are substances your body needs in small but steady amounts for normal growth, function and health. Together, vitamins and minerals are called micronutrients. Your body can't make most micronutrients, so you must get them from the foods you eat or, in some cases, from supplements.

Vitamins: Partners in regulating body functions

Vitamins are needed for a variety of biologic processes, among them growth, digestion, mental alertness and resistance to infection. They also enable your body to use carbohydrates, fats and proteins, and they act as catalysts — initiating or speeding up chemical reactions. Though vitamins are involved in converting food into energy, they supply no calories.

Vitamins can be either water-soluble or fat-soluble.

Water-soluble vitamins. Vitamin C, biotin and the seven B vitamins — thiamin (B-1), riboflavin (B-2), niacin (B-3), pantothenic acid (B-5), pyridoxine (B-6), folic acid (B-9) and cobalamin (B-12) — dissolve in water (water-soluble) and aren't stored in your body in any significant amounts. Surplus water-soluble vitamins are simply excreted in your urine.

Fat-soluble vitamins. Any extra vitamin A, D, E or K not used by your body right after ingestion is stored in your body fat and liver. Excess fat-soluble vitamins can accumulate in your body and become toxic. You're especially sensitive to excess amounts of vitamins A and D. Because vitamins E and K affect blood clotting, talk with your doctor before taking a supplement that contains either of these vitamins if you're taking a blood thinner, such as warfarin (Coumadin).

Minerals: Building blocks for your body Minerals are the main components in your teeth and bones, and they serve as building blocks for other cells and enzymes. Minerals also help regulate the balance of fluids in your body and control the movement of nerve impulses. Some minerals also help deliver oxygen to cells and help carry away carbon dioxide.

Minerals have two categories:

Major minerals. Calcium, phosphorus, magnesium, sodium, potassium, sulfur and chloride are considered major minerals because adults need them in larger amounts — more than 250 milligrams (mg) a day.

Trace minerals. Chromium, copper, fluoride, iodine, iron, manganese, molybdenum, selenium and zinc are considered trace minerals because your body needs them in smaller amounts — fewer than 20 mg a day.

Whole foods: Your best source of micronutrients

Whole foods are your best sources of vitamins and minerals. They offer three main benefits over supplements:

   Whole foods are complex. They contain a variety of the micronutrients your body needs — not just one. An orange, for example, provides vitamin C but also beta carotene, calcium and other nutrients. A vitamin C supplement lacks these other micronutrients.

Whole foods provide dietary fiber. Fiber is important for digestion and can help prevent certain diseases such as cancer, diabetes and heart disease. Adequate fiber intake can also help prevent constipation.

Whole foods contain other substances that appear to be important for good health. Fruits and vegetables, for example, contain naturally occurring food substances called phytochemicals, which may help protect you against cancer, heart disease, diabetes and high blood pressure. Many are also good sources of antioxidants — substances that slow down oxidation, a natural process that leads to cell and tissue damage. If you depend on supplements rather than eating a variety of whole foods, you miss the potential benefits of these substances.

Who needs vitamin and mineral supplements?

Many people don't receive all of the nutrients they need from their diet because they either can't or don't eat enough, or they can't or don't eat a variety of healthy foods. For some people, including those on restrictive diets, multivitamin-mineral supplements can provide vitamins and minerals that their diets often don't. Pregnant women and older adults have altered nutrient needs and may also benefit from a supplement.

Choosing and using supplements

Supplements, as the term suggests, can complement your regular diet, but they aren't food substitutes. They can't replace the hundreds of nutrients found in whole foods. But if you do decide to take a vitamin or mineral supplement, consider these factors:

     Check the supplement label. Read labels carefully. Product labels can tell you what the active ingredient or ingredients are, which nutrients are included, the serving size — for example, capsule, packet or teaspoonful — and the amount of nutrients in each serving. The label also provides directions for safe use and tips for storage along with the name and address of the manufacturer, packer or distributor where you can write if you need more information on a particular product.

 Avoid supplements that provide "megadoses." In general, choose a multivitamin-mineral supplement — for example, Centrum, One A Day, others — that provides about 100 Percent Daily Value (%DV) of all the vitamins and minerals instead of one that supplies, for example, 500%DV of one vitamin and only 20%DV of another. The exception to this is calcium. You may notice that calcium-containing supplements don't provide 100%DV. If they did, the tablets would be too large to swallow. Most cases of nutrient toxicity stem from high-dose supplements.

Classification of Vitamins.

http://www.chemistry.wustl.edu/~courses/genchem/Tutorials/Vitamins/home.htm

The vitamins may be classified as under:

 I. Fat Soluble; II.Water Soluble

I. Fat Soluble Vitamins.

These are: (1) Vitamin A or Fat Soluble A (Retinol) is a glamour or protective vitamia Akin to a fertiliser of "lawn" it performs a variety of functions in the epithelial tissues in the body. It is a safety valve for the visual process and the lung tissues.

It is anti-infective and growth-promoting vitamin. Its deficiency causes the following effects:

1.       Retards growth and lowers resistance to bacterial infection.

2.       Xerosis. Xerophthalmia, or dryness and infection.

3.       Night blindness (inability to see in dim light) due to retardation of the regeneration of visual purple.

4.       Atrophy of the cells of salivary glands and mucous membrane of the intestines,

5.       Dryness of skin owing to atrophy of the sweat and sebaceous glands or Keratinisation of epithelial tissues; a condition resembling "Toad skin" occurs,

6.       Formation of phosphatic calculi,

7.       Respiratory infections like common colds, bronchitis etc.

8.       Faulty development of teeth and spongy gums.

Pro-vitamin A is present in abundance in the yellow pigment of plants known as Carotene which has been isolated in the pure form. Fat soluble Vitamin A is present in milk, butter, ghee, fish fat, cod liver oil, kidneys, mutton, eggs and other animal fats. Green leafy vegetables, fruits, carrots, cabbage, mangoes and papaya are rich sources of vitamin A. It is not destroyed by ordinary cooking, although if cooking is prolonged or if the food is exposed to air it gets destroyed. Human requirement for vitamin A is 5,000 International Units for adults daily, being equivalent to 1.2 microgramme of carotene.

(2) The Sun Shine Vitamin D (Anti-Rachatic Vitamin) fotoRickets.jpg  transforms calcium and phosphorus into bones. It is essential for good teeth, better sleep, relaxation and for prevention and cure of rickets and osteomalacia. It is thermostable i.e., withstands high temperature uninjured. It is present in egg yolk, cod liver oil, halibut liveroil, butter fat and ghee, etc., in the form of Cholecakiferol (Vitamin D3). Cod liver oil is the richest source of vitamin D. In this respect 5 eggs are equivalent to 1 teaspoonful of cod liver oil.   Calciferol   is   a   preparation produced by the irradiation of ergosterol with ultraviolet rays and is termed as vitamin D2. Naturally it is produced in the skin by the action of ultraviolet rays of sun. A liberal supply of vitamin D to mothers during gestation and lactation renders their children less susceptible to rickets. Moreover, it corrects, improper balance of calcium and phosphorus intake and is necessary for their absorption. Its deficiency leads to rickets and dental caries in children and osteomalacia in adults, particularly among women observing purdah or persons dwelling in dark houses, where sunshine is not readily accessible. Daily requirement of this vitamin in children and adults is 400-1000 International Units.

(3) Vitamin E or Anti-Sterility Vitamin. It was discovered by Dr. Evans of U.S.A. who named it Vitamin E. It is also a fat soluble vitamin. It is stable to heat and light, but is destroyed on oxidation, specially in the presence of alkaline salts. It promotes reproduction. It is present in wheat, cereal embryos, green leaves of plants and some vegetable oils. Tocopherol, an oil extracted from wheat germ is the most potent known source of Vitamin E. Its deficien­cy leads to death of foetus in uterus and sterility in males and females of the lower animals. It is therapeutically used in threatened and habitual abortion.

(4) Vitamin K or Coagulation Vitamin. It is essen­tial for the normal coagulation of the blood. Its sour­ces are green leaves, spinach, cauliflower, cabbage, carrot-tops, etc. The part of the plants which con­tains chlorophyll usually has the largest amount of vitamin K. It is stable to heat. Its main function is the formation of prothrombin. Its deficiency leads to hypoprothrombinemia, occurrence of haemor­rhages in the skin and subcutaneous tissues of organs due to prolongation of blood-clotting.

II. Water Soluble Vitamins.

These are: (1) Vitamin B Complex. If а members of this group are absent from the diet, they produce:

Cardiovascular symptoms such as loss of breath on exertion, palpitation and precordial pain.

Anorexia leading to complex distaste for all food and relieved by aneurin.

Diminution of nerve excitability leading to peripheral neuritis hypoaesthesia and pain along the nerve trunks.

From the complex mixture the following con­stituents have been isolated:

Vitamin B1  is sensitive to heat Aneurine hydrochloride or Thiamine is the synthetic preparation used. It is considered anti-neurotic and anti beri-beri, dry or wet. It's deficiency is like "an automobile with a full tank of gasoline, but no spark to ignite it". As a morale vitamin, a lack of it means loss of appetite, indigestion, constipation, nausea, weak heart muscles, palpitation, breathlessness and degeneration of nervous system. It is present in brewers yeast, beans, bran, wheat germ oil, sun flowers seeds, nuts particularly ground nut, meat, fish, eggs etc. Milk and highly milled rice are its poor sources. The use of anti-biotics and alcohol adversely affects this vitamin. The daily requirement of this vitamin is 2 mg.

Vitamin B2. It is of great value in human nutri­tion. It is designated as Riboflavine. It is a water soluble yellow pigment and is found in yeast, milk, eggs, fishroe, pork, liver and green leafy vegetables. It is highly heat stable and survives even canning. It is essential for the main­tenance of normal fat metabolism. Ocular manifes­tations, chelosis, photophobia, burning, itching an­gular stomatitis, glossitis and dermatitis of skin are due to its deficiency, which occurs most commonly in those individuals or communities whose diet con­sists mainly of milled rice. The estimated daily re­quirement of this vitamin is about 2-3 m. gms.

Vitamin P.P (Pellagra-preventing factor) Niacin or Nicotinic Acid is the factor concerned in pellagra. It is remarkably stable, capable of withstanding heat, oxidation and ultra violet light. It maintains healthy condition of skin and mucous membrane. Its sources are meat, liver, kidneys, yeast, whole meal flour, bread, green vegetables, mangoes, etc. Its deficiency leads to pellagra which is charac­terised by 3 D's—dermatitis, diarrhoea and demen­tia. The most typical symptom is erythema. Its daily requirement is about 15-30 m. gms.

Vitamin B6, or Pyridoxine or anti-Dermatitis Vitamin. It is essential for normal protein metabolism. It is necessary for haemoglobin syn­thesis and also as an anti-dermatitis factor. It is present in rice polishing, yeast, liver, yolk of eggs, fat, peanuts and wheat germs. Its deficiency leads to muscular dystrophy, rigidity and dermatitis in rats.

Biotin, Vitamin H. It is related to fat and car­bohydrate metabolism. Its chief sources are liver, eggs, yeast and cereals. Its deficiency causes der­matitis and eczema. Its daily requirement is 150 m. gm.

Folk Acid. It stimulates blood formation. It is important for haemopoietic factor and is used extensively in macrocytic and pernicious anaemia. It is present in liver, kidneys, yeast and leafy vegetables.

Inositol (Mouse Anti-Alopecia Factor). It is associated in some way with metabolism or transport of fat. It is important for anti-alopecia factor. Its deficiency is characterised by loss of hair.

Vitamin B12 Cyanocobalamin. It has been isolated from liver. It cures pernicious anaemia in very small doses. It is a "Pep" vitamin for a healthy nervous system and the production and development of red blood cells. It is highly useful among confused, depressed, anaemic and forgetful persons. It is a costly vitamin, since about a ton of liver is required to prepare only 20-25 m.gm. of vitamin B12.

Para-Amino-Benzoic Acid. It helps tissue oxidation.

Pantothenic Acid. It is also known as "chick anti-dermatitis factor." It is used in the form of cal­cium salt, which is a white crystalline salt and is odourless. Its deficiency causes burning on the soles and palms, dermatitis and defective vision. Its daily human requirement is 100 m. gm.

Choline. Its deficiency causes deposition of fat in liver, degeneration of liver and kidneys. Its daily requirement is 2 gms.

II. Vitamin C or Anti-Scorbutic Vitamin. It is chiefly present in all living tissues, fresh fruits such as oranges, lemons, tomatoes, turnips, potatoes and fresh green vegetables. This vitamin is destroyed on prolonged heating and in preservation of fruits. It is an anti-scorbutic vitamin. It is essential for maintaining capillary in­tegrity and for formation of intercelluar substance. It is essential for the maturation of red blood cor­puscles. Its deficiency leads to scurvy, a disease characterised by swelling of gums, anaemia, bad teeth, offensive breath, spongy gums, loss of weight, delayed healing of wounds and haemorrhages. The average daily requirement of this vitamin is 50-100 m. gms. Since vitamin C cannot be stored in the body so a daily intake of the recommended dose is neces­sary for good health. 

Vitamin P. It occurs naturally along with vitamin C in fresh fruits, particularly  lemons and fresh salads. It helps in preventing capillary permeability and its deficiency leads to purpura, spontaneous capillary haemorrhages and infiltration of lungs resembling tuberculosis.

5.  Problems  of Over-nutrition

Obesity: The main features of obesity are overweight and fatness.It is mostly caused by overeating and intake of abun­dance of calories

Obesity
Classification & external resources

 

Hypervitaminosis A is at times caused by excess of vitamin A therapy. The manifes­tation are headache, nausea, vomiting, irritability and anorexia. Carotenaemia is also caused due to excessive consumption of carrots which is charac­terised by yellow skin with normal conjunctiva,

The toxic manifestations of hypervitaminosis D are anorexia, nausea, vomiting, thirst, polyuria and drowsiness. Calcium and phosphorus levels in serum and urine are raised. Calcium may be deposited in many tissues also,

Fluorosis occurs if fluorine is available > 1,5 mg in water. It is characterised by (a) dental fluorosis, i.e., mottled enamel of teeth and (v) skeletal fluorosis i.e., dense bone formation, severe spondylitis and even calcifications of ligaments of spine and tendinous inflamation of other muscles in severe cases.

Fruit Group:

Just like vegetables, fruits are full of vitamins A & C and minerals your body needs for healthy skin, hair and eyes.

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The Basics:

Staying healthy includes a balanced diet, staying clean, getting plenty of exercise as well as keeping your heart strong and free of drugs.

People who practice good nutrition, hygiene and exercise patterns develop a lifetime of habits that will keep them healthy for many years. Especially when they are older!

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Let's see, how can we be sure to get a balanced diet? We think the nutrition information given below will be very helpful for you.

The Food Guide Pyramid helps to promote the 3 basic rules for a healthy diet:

1.     Variety

2.     Balance

3.     Moderation

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Variety means that you must include many different foods from each level of the Food Pyramid because no single food can supply all of the nutrients that your growing body needs on a daily basis. This can help to expand your food choices. It is best to eat foods of all colors. The more colors and textures in your daily meals, the better range of nutrients you'll get.

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Balance means that you must eat the right amounts of foods from all levels of the Food Pyramid each day. This way you will get all the calories and nutrients you need for proper growth and development.

Moderation means that you are careful not to eat too much of any one type of food.

Let's take a closer look at the Food Pyramid to see how it can help you to plan good meals.

To make the most out of the Food Pyramid, we'll need to figure out what counts as a serving. Let me help explain this. Next to each section of the Pyramid below you will see how many servings of each food it suggests that you have each day.

VEGETARIANISM

Vegetarian diets appeal to people for various reasons. For some people, religious and philosophical teachings prompt adherence to a vegetarian regimen. Other people seek health benefits.

There is much to be said for most of us making our food choices in the direction of vegetarian principles, eating less meat and eggs and substituting foods of vegetable ori­gin. Such choices will reduce the amount of fats, particularly the saturated ones, and in­crease the amount of fiber consumed. Although such choices will reduce the amount of protein we eat, most of us con­sume more protein than we need.

At the same time, a poorly planned vege­tarian diet can put you at risk for disorders such as vitamin B12 deficiency iron-deficiency anemia, growth retardation (in persons who have not yet achieved their full adult growth), and osteoporosis, to name a few. Avoiding these risks means devising a healthful vege­tarian diet—that is, one in which all of your body's nutrient needs are met.

Careful planning is the key to such a diet. Because many of the nutrients a human body needs are found most readily in animal prod­ucts, finding substitutes requires effort.

There are various degrees of food restric­tions in vegetarian diets. Total vegetarians, known as vegans, restrict their foods to those of plant origin only. Fruitarians further re­strict their foods to only raw or dried fruits and nuts, honey, and olive oil. Lacto-vegetarians eat foods of plant origin plus milk and other dairy products. Lacto-ovovegetarians eat plant foods, milk and other dairy products, and eggs.

Obviously, the question of the nutritional adequacy of a particular vegetarian regimen depends on the extent of food restrictions. Also, children and teenagers, pregnant and lactating women, and people recovering from a serious illness or injury who are veg­etarians need to take precautions to ensure that all of their body's needs are met. Such people should follow a vegetarian regimen only with the careful supervision of an expe­rienced, registered dietitian.

Protein is of some concern when planning a strict vegetarian diet. Protein found in foods of plant origin tends to have only small amounts of one or more essential amino acids. (Essential amino acids are those that your body cannot manufacture—you must obtain them from your diet.) Protein from an­imal sources contains essential amino acids in an optimal proportion.

Grains and cereals with ingredients in­cluding wheat, com, oats, and rice provide some essential amino acids, while legumes such as peas, peanuts, and dry beans provide others. When, during the course of a day, you combine a grain with a legume, or cornmeal with beans, you have a more nearly complete set of essential amino acids.

Another important nutrient in the vegetarian diet is vitamin B12. Vegetarians who consume milk or eggs will get enough of this vitamin. Those who do not can eat foods ar­tificially enriched with vitamin B12. Some commercial foods made from soybeans and other plant proteins are fortified with vitamin B12. A deficiency of this vitamin is a serious medical disorder.

Vegetarians who eat eggs and dairy prod­ucts also usually receive enough calcium and riboflavin, but the vegan has to devise special dietary strategies. Many foods of plant ori­gin contain calcium, but they may not be as easily used by the body because of the pres­ence of fiber and oxalic acid in the foods. Oxalic acid and fiber may interfere with the body's ability to use the calcium present in the foods. Thus, if you are a strict vegetarian, you may need calcium supplements.

Vitamin D, iron, and zinc are other nutri­tional elements needing special attention in the vegetarian diet. Most of us obtain vita­min D through fortified milk and exposure of our skin to sunlight. If you do not drink milk, you must rely on sunlight or on a vita­min supplement. However, children and pregnant and lactating women who are veg­etarians should not rely solely on sunlight but should take a supplement.

The high fiber content of most vegetarian diets tends to impair the absorption of iron and zinc. Good sources of iron include en­riched cereals and grains, legumes, dates, prunes, raisins, and leafy green vegetables. You can enhance absorption of the iron in vegetables by including citrus fruit or juice or other foods high in vitamin C with meals that contain plant sources of iron. Vitamin C helps increase the iron absorption from plant foods. Good sources of zinc include legumes and nuts.