How much Vitamin A should they have?

他们应该摄入多少维生素A

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Now the fact that people were so reliant on certain foods led to deficiencies of certain nutrients, so people that were dependent on a rice based diet tended to have problems with deficiencies in protein, Vitamin A, and thiamine.

人们过于依赖某些特定的食物,导致了某些营养元素的匮乏,因此,以米饭为主食的人,很可能缺少蛋白质,维生素A和维生素B1

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选