Common Nutrient Deficiencies for Adult Men
8. Vitamin A
Vitamin A deficiencies are linked to an increased risk of several types of cancer, as well as macular degeneration, which can lead to blindness.
Most adults in the United States consume enough foods to maintain sufficient levels of vitamin A, but smoking or chewing tobacco hinders vitamin A absorption. Taking too much of a vitamin A supplement can also increase the risk of lung cancer among smokers.
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