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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 ...
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 ...
A few experiments performed on vitamin deficiency, such as one conducted to determine the effects of Vitamin A deficiency and to optimize its treatment. In that study, 23 men and women volunteered to live on a diet deficient in vitamin A. However, this experiment lasted considerably longer than expected, from July 1942 to October 1944, and the ...
Vitamin D and calcium are essential for overall health, but don’t reduce the risk of falls or fractures in generally healthy older adults, according to a new draft recommendation from the US ...
Vitamin A supplements top Norman's do-not-fly list for his patients over 50. "Studies have shown that a healthy and diverse diet will get you enough vitamin A, and food sources are the best ...
Retinol, also called vitamin A 1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [3] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes, immune function and reproductive development. [3]
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