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 DEFINITION
The vitamins are vital substances (of the Latin vita = life) or effective substances and they form the second set of important nutritive substances. It is fundamental that these are not considered to be only medicines.
CLASSIFICATION
His specific denomination is by means of the letters of the alphabet, but the only useful classification divides them in:
- Hidrosolubles: soluble in water.
- Liposolubles: soluble in fat.
FUNCTIONS
The vitamins are multiple and essential for the normal metabolism, development and growth of the organism and the cellular regulation. They work jointly with the enzymes (a type of proteins that help them to exercise his effects), co-factors (elements that also are necessary for the above mentioned works), and other substances.
NEEDS
The vitamins are contained in a normal nutritive composition and only in cases of special scarcity or illnesses, a contribution can be necessary vitamínica supplementary that, in such a case, must be prescribed by the doctor. The most important vitamins for the man are the A, those of the group B, the C, D, E and K.
FEEDING
In a varied and balanced diet, especially when it contains food in the raw or natural state, all the vitamins necessary for the vital activity are in sufficient quantity. But during the making or food preservation, the necessary minimal quantities can suffer important decreases. For it the feeding humanizes, in addition to elaborated food (stews, fried food, in conserve or frozen) has to consist of raw and natural food (as there are, for example, the fresh vegetables that take in salads).
The same vitamin C exposed to the air suffers a decrease; this way it happens when the juices of fruit or vegetable are not consumed immediately. The orange juice loses half of his content in vitamin C to the half an hour of having been squeezed.
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DESCRIPTION 
