We define a food any substance to restore the function of the body waste, growth, or keep warm, muscular and nervous energy. In its broadest sense, the oxygen in air is a food, as has been recognized by the lungs into the blood, and again the acts of the other food that has passed through the stomach. It is common, however, the long-term food is limited to the nutrients the body through the intestinal tract. Water is often spoken of as other than food, but this is not enough reason.Many popular writers have divided food into flesh-formers, heat-givers, and trainers of bone. Although the attractive simplicity, this classification is also responsible for heat criticism.Flesh donors. Only part of the mineral matter is to be formed bone.Water is an essential component of all body tissues. Is the solvent and other salts substances.Mineral matter, is left as ash when food is completely burned. The main calcium phosphate salts, carbonate and fluoride, sodium chloride, phosphate and potassium chloride, and compounds of magnesium, iron and silicon.Mineral case is very necessary for plants and live animals, and therefore present in all foods, except for some very ready, such as sugar, starch and oil. Children need an appropriate ratio of calcium phosphate in bone growth, while adults require less. The outside of the wheat seed is the richest in mineral elements, white flour and rice are inadequate. The wheat flour and oatmeal are especially recommended for the amount of phosphates and other salts in them. The mineral matter is not only necessary for bones, but all tissues body.Organic compounds are formed by living organisms (some may also be produced by chemical means). They are not completely degraded by combustion.The and nitrogen containing organic compounds and carbon compounds are usually heat-producers, but these terms are descriptive of nitrogen compounds. Containing carbon, hydrogen and oxygen alone, and deliver their oxidation or burning of the body the required heat, muscular and nervous energy. The final product of combustion is water and carbon dioxide (carbon dioxide). Carbohydrate is starch, sugar, gum, mucilage, pectose, glycogen, & c., the cellulose fibers and wood are carbohydrates, but are not suitable for digestion. Containing hydrogen and oxygen in the proportion to form water, carbon is only available to produce heat through combustion. Starch is the most common food. It is insoluble in water, but when cooked is easily digested and absorbed by the body. Starch is readily converted into sugar, or in plants or animals, during digestion. There are many types of sugar such as grapes, sugar and oils and milk fats sugars.The include the same elements as carbohydrates, but the hydrogen is in greater quantity than is necessary to form water, and this surplus is available for energy production. During combustion in the body, producing almost two years and twenty five percent (4: 8.9 = 2.225) as much heat as the carbohydrates, but only if consumed in small quantities, not easily digested, a portion death of the intestines. The fat in the body depends not only on the amount consumed as food, as foods that an animal can become very big no. A moderate amount supports digestion and physical health. In cold weather more should be taken. In the Arctic regions of the Eskimos consume large quantities. Nuts are generally rich in oil. Oatmeal contains more than one of the other cereals (27 analyzes gave 8 to 12.3 percent). Vegetable acids include the same three elements and subjected to combustion in the same substances as carbohydrates. That whetted the appetite, stimulates digestion, and finally, the carbonates form in connection with the alkalis, the alkalinity of the blood. The most important vegetable acids are: malic acid in apples, pears, cherries, etc, citric acid in the lemon, lime, orange, blackcurrant, blueberry, strawberry, raspberry, etc, tartaric acid in grapes, pineapple, & c.Proteids or meat albuminoids often called trainers. They are composed of nitrogen, carbon, hydrogen, oxygen, and a small amount of sulfur, and are extremely complex organs. Its main function is the meat in the shape of the body, but without previous form, it can become fat or only give rise to heat. They are the most important of all life passes cell.Proteids