The Rise and Fall of Pellagra in the American South
研究20世纪上半叶美国南部糙皮病（因烟酸摄入不足导致的疾病）的兴衰，发现棉花单一作物制损害营养，而棉铃象甲虫入侵后食物生产增加、糙皮病减少；1937年后医学进步和食品强化法帮助根除该病。
Focusing on the first half of the twentieth century, we explore the rise and fall of pellagra (a disease caused by inadequate niacin consumption) in the American South. We first consider the hypothesis that the South’s monoculture in cotton undermined nutrition by displacing local food production. Consistent with this hypothesis, a difference in differences estimation shows that after the arrival of the boll weevil, food production in affected counties rose while cotton production and pellagra rates fell. The results also suggest that after 1937 improved medical understanding and state fortification laws helped eliminate pellagra.