Scientists say there are seven kinds of food that people should eat every day. They are: (1) green and yellow vegetables of all kinds; (2) citrus (柑橘类) fruits and tomatoes; (3) potatoes, other fruits and vegetables; (4) meat of all kinds, fish and eggs; (5) milk and food made from milk, like cheese and ice-cream; (6) bread or cereal (谷类)   (rice is also in this kind of food) ; (7) butter or something like butter with fat (脂肪) .

People in different countries in the world eat different kinds of things. In some places, people eat once or twice a day; in other countries, people eat three or four times a day. Scientists say that these differences are not important. It doesn’t matter if a person eats dinner at 4 o’clock in the afternoon or at 11 o’clock at night. The important thing is that every day a person must eat something from each of the seven kinds of food. The most important thing is that we must find some ways to help the hungry people and make the people have right kinds of food, make them strong and healthy.

Last month we asked 1055 students in our city about their living habits. They are teenagers between 13 and 16 years old. Our questions were about exercise, eating fruit and vegetables, and doing eye exercises. The results are shown below:

More and more students pay attention to their health. However, it’s difficult for them to exercise quite often because of hard schoolwork. Some students don’t have any time to exercise. The survey shows that most of them eat fruit and vegetables very often. Most students do eye exercises every day, which improves the situation of short-sighted (近视眼的) students.

Experts suggest that students should balance their exercise and diet. Parents should manage to spend more time with their children going out to nature to exercise and enjoy themselves. It is good for both the mind and the body.

Although many people agree that junk food is unhealthy and has little nutrition(营养), they are still fond of it.

What is junk food?

Junk food has a lot of fat, salt or sugar and many food additives(添加剂). Scientists believe that eating a lot of junk food makes people overweight. People may also have their heart diseases, high blood pressure and tooth problems if they eat too much junk food. What is junk food? For example, fast food such as hamburgers, pizza and French fries, is often regarded as junk food. Also, soft drinks are junk food because they have a lot of sugar. But honey and grapes are not.

Why do people like it?

The name “junk food” first appeared in 1972. Over the years, it has become popular with many people. Sellers are fond of it because it is cheap to make and easy to keep for a long time. Many customers are fond of it because it is easy to buy and tastes good.