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Pellagra
About Pellagra
The 4 Ds: dermatitis, diarrhea, dementia, and death. Rampant in the American South in the early 1900s, killing over 100,000. Joseph Goldberger proved it was dietary, not infectious, in 1914. Niacin fortification of flour eliminated it. Despite evidence, some doctors insisted it was contagious.
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