1. food & diet

diet指的是习惯上吃的的食物或规定的是食物

food是一般的词语,凡能吃的东西都可称为food , 是不可数名词; 但表示种类时是可数名词。

The _____ that you buy in supermarkets are rich in sugar, fat and salt. Proper _____ and exercise are both important for health.

food

diet

Too many sweet foods will make you fat.