Introduction. Night blindness is one of the early warning signs of a deficiency in Vitamin A. Each year, between 250,000 and 500,000 children lose their sight because they do not consume enough Vitamin A, and half of those will die within twelve months of losing their sight. Also, many pregnant women in developing countries suffer from night blindness as a symptom of Vitamin A deficiency, a problem compounded by mortality during pregnancy and childbirth, as well as difficulties in birth and in performing lactation (Rahi, et al., 1995, p. 332). In addition to night blindness, Vitamin A deficiency can impair ...
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Vitamins are essential organic nutrients required in minute amounts for the body's optimal functioning. They could be water soluble or fat soluble. Water soluble vitamins include; vitamins Band C, while the fat soluble vitamins are; Vitamins A, D,E,K. Vitamin A was the first fat soluble Vitamin to be discovered in 1913.
Vitamin A's structure is depicted to the right. Retinol is the precursor of of retinal and retinoic acid. Both are active metabolites of retinol. Retinal plays an important role in vision while retinoic acid is the intracellular messenger which affects the transcription of some gene( Bates ...
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