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Vitamins are organic compounds, which human's organism cannot produce (or produces them in little amount in digestive system thanks specific bacterial flora), they must be provided together with food in finished form or form of provitamins, which dur

Dietary fiber or dietary fibre (alternate names: roughage, bulk, diet-fiber) is a complex of substances of cell walls of plants which are not digested and not absorbed in a human's digestive tract. It is a mixture of substances of polysaccharide char

In nature about 135 kinds of water exist. In cells of our organism water is in special form, which we call "structural". Every another fluid, which enters our body, must be processed and purified. Average water content in an adult organism is about 6

Lipids (fats) belong to a big group of natural organic compounds, insoluble in water but soluble in organic dissolvents such as: diethyl ether, petroleum benzine, chloroform, benzene, acetone etc. To lipids (fats) also belong derivatives of natural l

Carbohydrates (also saccharides or commonly sugars) are organic compounds - multihydroxide alcohols consisting of carbon, hydrogen and oxygen, in which hydrogen to oxygen ratio is the same as in water (H2O) so it equals 2:1. Carbohydrates are in all