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Vitamin A deficiency (VAD) or hypovitaminosis A is a lack of vitamin A in blood and tissues. [1] It is common in poorer countries, especially among children and women of reproductive age, but is rarely seen in more developed countries. [1] Vitamin A plays a major role in phototransduction, so this deficiency impairs vision, often presenting ...
A major cause of Bitot's spots is vitamin A deficiency (VAD). [4] Rarely, pellagra due to deficiency of vitamin B 3 (niacin) may also cause Bitot's spots. [5] They can also be caused by Colestyramine , which is a bile acid sequestrant which can reduce the absorption of fat soluble vitamins (Vitamins A, D, E, K)
Vitamin A deficiency is "the leading cause of preventable childhood blindness", according to UNICEF. [10] [22] It also increases the risk of death from common childhood conditions, such as diarrhea. UNICEF regards addressing vitamin A deficiency as critical to reducing child mortality, the fourth of the United Nations' Millennium Development ...
Certain vitamin and minerals deficiencies are common in people with porphyria cutanea tarda. The most common deficiencies are beta-Carotene, [7] retinol, [8] vitamin A [9] and vitamin C. Beta-Carotene is required to synthesize vitamin A and vitamin A is needed to synthesize retinol.
One culprit is vitamin D deficiency. Not receiving enough of this vital nutrient can lead to all sorts of health issues, from osteoporosis to depression. ... a woman between 19 and 70 but check ...
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Treatment of the deficiency can be accomplished with a vitamin A or multivitamin supplement or by eating foods rich in vitamin A. Treatment with supplements and/or diet can be successful until the disease progresses as far as corneal ulceration, at which point only an extreme surgery can offer a chance of returning sight.
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