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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 ...
The recommended dietary allowance of vitamin A is 900 micrograms (mcg) a day for men and 700 micrograms for women. That said, vitamin A deficiency is very uncommon in developed countries.
Supplementation with folate can mask vitamin B 12 deficiency. [39] [40] Consuming a vegan diet increases the risk, since Vitamin B 12 is mostly found in food and drinks made from animal products, including eggs and dairy products. Vitamin C deficiency: Deficiency leads to weakness, weight loss and general aches and pains.
Several factors can cause a person to have classic signs of dementia, including a deficiency in vitamin B12. ... But Cohen says there are plenty of other risk factors for vitamin B12 deficiency ...
The WHO estimates that 5.2 million of these children under five are affected by night blindness, which is considered clinical vitamin A deficiency. [121] Severe vitamin A deficiency (VAD) for developing children can result in visual impairments, anemia and weakened immunity, and increase their risk of morbidity and mortality from infectious ...
Certain factors can put you at more risk of dealing with male pattern baldness. Many of these risk factors can also affect the severity of hair loss you experience, from a mild receding hairline ...
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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