They’re found in reasonable portions in nearly all entire meals we devour, including fruit and greens, in addition to meats, eggs, nuts and seeds, though some meals include significantly excessive ranges of vitamins and as such may be termed superfoods.
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In 1930, Paul Karrer elucidated the proper construction for beta-carotene , the main precursor of vitamin A, and identified different carotenoids Karrer and Norman Haworth confirmed Albert Szent-Györgyi’s discovery of ascorbic acid and made significant contributions to the chemistry of flavins , which led to the identification of lactoflavin For their investigations on carotenoids, flavins and vitamins A and B2, they each received the Nobel Prize in Chemistry in 1937.
Properly-identified human vitamin deficiencies contain thiamine ( beriberi ), niacin ( pellagra ), 32 vitamin C ( scurvy ), and vitamin D ( rickets ). 33 In much of the developed world, such deficiencies are uncommon; this is due to (1) an adequate supply of food and (2) the addition of vitamins and minerals to common meals ( fortification ). 8 18 Along with these classical vitamin deficiency illnesses, some evidence has additionally urged links between vitamin deficiency and various completely different problems.