Healthy food is good for health? 1? three

Healthy food is good for your health. We should eat healthy food. Healthy food, including vegetables, fruits, fish, meat and so on. But we should keep an adequate diet. We can't eat too much of certain foods. We know that some of our students don't like to have lunch at school because the food is not delicious. So they often go out of school to buy something they like to eat. But I'm worried that eating lunch outside is harmful to their health, because some of the food they bought is not healthy enough.