Prevalent among U.S. Southerners during the early 1900s, pellagra was first thought to be an infectious disease. Today we know that it is caused by a deficiency of

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Pellagra is caused by a deficiency of niacin, also known as vitamin B3. It can result from a diet lacking in niacin or from an inability to absorb or convert niacin from food. Symptoms of pellagra include skin rashes, digestive issues, and neurological problems.

Prevalent Among U