If you ate the same food day after day after day, you'd have too many of some nutrients and too little of others, and you become nutritionally deficient.

如果你日复一日的只吃一种食物,某类营养就会过剩,而另一些则会不足,你就会营养不良

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选