Vitamins

Vitamins are organic elements. They don’t have plastic or energy  functions as carbohydrates or fats, but they are essential for cells function and for the organism survival.

Vitamins work as bio-regulators. They acting on specific functions and cellular activities, its role is essential and specific for the proper performance of basic physiological processes.
 

Vitamins are not synthesized by the human body, that's why they must be included in the diet every day. 
 

The term vitamin came from the German, it means  "amine of life" which was the name given by Casimir Funk to the thiamine having identified an amino group in its structure.

Vitamins are distinguished and classified as follows:
 

fat-soluble vitamins, meaning soluble in fat:  vitamins A, D, E, K, F;
 

water-soluble vitamins, meaning soluble in water: vitamin C, B1, B2, B5, B6, PP, B12, Bc, H.

 

Vitamins are found in fruits and vegetables, but also in the milk into the eggs in the fish and other animal products.

Our body needs a certain amount of vitamins.

An excess of some vitamins can be harmful. In fact, fat-soluble vitamins such as vitaminA and D are fixed in the fatty tissues and their accumulation can damage the liver and other organs that are protected from these tissues. The excess of water-soluble vitamins is less dangerous because the amount is eliminated superfluous with sweat or through the urine.
However,it is harder to excess in vitamins with a normal diet without supplements.

The needs  of those Vitamines increases in dependence on environmental factors  or by the age, sex, health stress and physical activity.