Pellagra

Pellagra, a disease prevalent in the American South post-Civil War, was identified as non-contagious and related to diet deficiencies in milk, meat, or eggs by Joseph Goldberger through experiments on prisoners. While contagious transmission was ruled out, the specific dietary deficiency was still undetermined but termed the pellagra-preventive factor.
 Joseph Goldberger United States 1915 Pellagra

Pellagra, a disease prevalent in the American South post-Civil War, was identified as non-contagious and related to diet deficiencies in milk, meat, or eggs by Joseph Goldberger through experiments on prisoners. While contagious transmission was ruled out, the specific dietary deficiency was still undetermined but termed the pellagra-preventive factor.