Pellagra
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Pellagra is a disease. It is caused by a lack of niacin. Niacin is also known as vitamin B3. It is found in most foods, besides corn. A person can die from it if it is not treated. It will take 4-5 years to kill someone.
The main results of pellagra can be remembered as "the four D's": diarrhea, dermatitis, dementia, and death.