home care health: Vitamin - Eye specialist calls for consumption of Vitamin A foods

A vitamin is an organic molecule (or a set of molecules alongside combined chemically, i.e. vitamers) that is an critical micronutrient which an organism needs in small quantities for the proper vigorous of its metabolism. essential nutrients cannot be synthesized in the organism, either at every or not in satisfactory quantities, and as a result must be obtained through the diet. Vitamin C can be synthesized by some species but not by others; it is not a vitamin in the first instance but is in the second. The term vitamin does not combine the three other groups of valuable nutrients: minerals, vital fatty acids, and essential amino acids. Most vitamins are not single molecules, but groups of linked molecules called vitamers. For example, there are eight vitamers of vitamin E: four tocopherols and four tocotrienols. Some sources list fourteen vitamins, by including choline, but major health organizations list thirteen: vitamin A (as all-trans-retinol, all-trans-retinyl-esters, as capably as all-trans-beta-carotene and other provitamin A carotenoids), vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B5 (pantothenic acid), vitamin B6 (pyridoxine), vitamin B7 (biotin), vitamin B9 (folic bitter or folate), vitamin B12 (cobalamins), vitamin C (ascorbic acid), vitamin D (calciferols), vitamin E (tocopherols and tocotrienols), and vitamin K (phylloquinone and menaquinones).

Vitamins have diverse biochemical functions. Vitamin A acts as a regulator of cell and tissue addition and differentiation. Vitamin D provides a hormone-like function, changeable mineral metabolism for bones and new organs. The B perplexing vitamins accomplish as enzyme cofactors (coenzymes) or the precursors for them. Vitamins C and E decree as antioxidants. Both deficient and excess intake of a vitamin can potentially cause clinically significant illness, although excess intake of water-soluble vitamins is less likely to do so.

Before 1935, the without help source of vitamins was from food. If intake of vitamins was lacking, the upshot was vitamin nonattendance and consequent deficiency diseases. Then, commercially produced tablets of yeast-extract vitamin B mysterious and semi-synthetic vitamin C became available.

This was followed in the 1950s by the buildup production and promotion of vitamin supplements, including multivitamins, to prevent vitamin deficiencies in the general population. Governments mandated complement of vitamins to staple foods such as flour or milk, referred to as food fortification, to prevent deficiencies. Recommendations for folic biting supplementation during pregnancy edited risk of infant neural tube defects.

The term vitamin is derived from the word vitamine, which was coined in 1912 by Polish biochemist Casimir Funk, who lonely a puzzling of micronutrients indispensable to life, every of which he presumed to be amines. following this presumption was far along distinct not to be true, the "e" was dropped from the name. every vitamins were discovered (identified) between 1913 and 1948.

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