Although vitamin A deficiency is a major public health problem in developing cou

Question

Although vitamin A deficiency is a major public health problem in developing countries, vitamin A supplements are generally not advised for typical North Americans for several reasons. Check All That Apply Liver reserves of vitamin A for most North Americans are 3 to 5 times higher than that required to provide good health. Excess vitamin A can cause birth defects if taken during pregnancy. Liver toxicity can result from intakes of vitamin A as little as 3 times the Daily Value. Excessive vitamin A can lead to night blindness and xerophthalmia.

Explanation / Answer

Option 1st, 2nd and 3rd are correct. North Americans diet consist of mainly meat which provides higher amount of vitamin A. 90 % of the total vitamin A in the body is stored in liver. Thus, the liver reserve of vitamin A is 3 to 5 times higher in North Americans. Excess amount of vitamin A during pregnancy causes birth defect, miscarriage etc. Since, viamin A is stored in liver, higher amount of vitamin A accumulates in the liver cells and cuases damage to the liver.

Xeropthalmia and night blindness are caused by dificiency of vitamin A and thus option last is not applied.

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