A deficiency of vitamin A can cause deterioration to the outer parts of the eye's photoreceptors, which can damage vision. Which is why it is worrying to learn that 50% of all Americans are vitamin A deficient. Vitamin A, and vitamin E, which is also found in sweet potatoes, are wonderful for eye health and may prevent eye problems in the aging process and other degenerative damage. Vitamin A, which is a fat-soluble vitamin, is also beneficial to hormone health, which is especially good for women during pregnancy and lactation.

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