My teacher ask me something hard

A balanced diet must contain carbohydrate, protein, fat, vitamins, mineral salts and fibre. It must contain these things in the correct proportions.If there is not enough protein, you will not be able to grow properly and you will not be able to repair yourself i.e. wounds will not heal properly. If you do not have enough energy containing foods you will feel very tired, you will not have enough energy. If you have too much energy containing foods you will become overweight. If you think that you are overweight you might try taking more exercise to "burn off" some of the excess food which you ate at you last meal.

Balanced diet 即均衡飲食。

這問題是問, 何為均衡飲食?

You can follow whatever the health department or the TV said, eat more fruits and vegetables, and less meat; be sure to include all kinds of foods and all kinds of nutrition in your meals; etc.