Those of you in public health and there are some grad students here have probably heard this discussion before, but you guys aside, can anybody guess what might be explaining this relationship over in the left hand side?

你们当中如果有公共卫生学院的或研究生,也许就听说过这个问题的讨论,但那时你们只是旁听,有人能猜到是什么原因,造成左边的这个曲线形状吗

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选