In underdeveloped countries,severe vitamin A deficiency is a major cause of

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Severe vitamin A deficiency is a major cause of blindness, particularly in underdeveloped countries where access to vitamin A-rich foods is limited. This deficiency can cause irreversible damage to the cornea and other parts of the eye, leading to blindness. Spina bifida is caused by a deficiency of folic acid, megaloblastic anemia is caused by a deficiency of vitamin B12 and/or folic acid, and beriberi is caused by a deficiency of thiamine (vitamin B1).

In Underdeveloped Countries,severe Vitamin a Deficiency Is a Major Cause