People living in impoverished regions, as well as people with alcohol addiction, frequently have a niacin deficiency disease called

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Pellagra is a deficiency disease caused by a lack of niacin (vitamin B3) in the diet. It is commonly seen in impoverished regions where people have limited access to a variety of foods, as well as in people with alcohol addiction who have poor diets. Beriberi (A) is a thiamine (vitamin B1) deficiency disease, kwashiorkor (B) is a protein deficiency disease, scurvy (D) is a vitamin C deficiency disease, and rickets (E) is a vitamin D deficiency disease.

People Living in Impoverished Regions, as Well as People with Alcohol