Vitamins are organic substances in food, which are required in small amounts but cannot be synthesized in adequate quantities by the body and therefore have to be provided from the environment.

Contrary to popular belief, deficiencies of vitamins still occur in affluent countries, for example deficiencies of folate, vitamin B and Vitamin D and C.

These are particularly common in people on fad diets, veganand alcoholics.

Deficiency diseases are more prevalent in developing countries. For example, Vitamin A deficiency is a common cause of blindness in the developing countries.

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