--- a healthy diet? diet和food的区别：

diet指的是习惯性的食物或规定的事物,特指维持健康的食物，如病人的疗养食物,减肥者的食物；

food是一般的词语,凡能吃的东西都可称为food

The doctor has ordered me a special ______. Too many sweet ______ will make you fat. A balanced _______ is necessary for good health. The sick man can’t live without _______, but he must have a _____ without sugar.

diet

foods

diet

food

diet