Prevalent in the United States 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. Other symptoms of pellagra include dermatitis, diarrhea, and dementia. The disease was eventually linked to a diet consisting mainly of corn, which is low in niacin, and was more prevalent in populations that relied heavily on corn as a staple food.

Prevalent in the United States During the Early 1900s,pellagra Was