You have these broad things, like if you just got the population to eat less junk food and more fruits and vegetables, well you might be 80% of the goal line or 90% of the goal line, so some broad rules pretty much apply.

如果能遵守这些宽泛的规则,比如,如果能让人们少吃垃圾食品,多吃蔬菜和水果,那么将可达到目标的百分之八九十,因此某些宽泛的规则是广泛适用的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选