Everybody knows that healthy eating habits are important. Here are five good eating habits for you.

【小题1】. Drink at least 8 glasses of water a day. You may need even more water when you are exercising.

【小题2】. Breakfast is the most important meal of a day. You can have more energy(能量) after eating breakfast.

【小题3】. If you don’t have enough time to have a big meal, take some bread with you for a quick lunch. If you don’t have lunch, that will be bad for your health.

【小题4】. We should eat fruit and vegetables. Add (增加)a banana to your breakfast, have salad for lunch, and eat some vegetables at dinner. if someone doesn’t like to eat vegetables, he or she can eat some fruit instead (代替).

【小题5】. Try to have dinner at least 3 hours before going to bed. Your body needs time to digest（消化） most of the food before you rest for 8 hours.

Thanks to better health care, most people are living healthier and longer lives. Someone who is born today can expect to live about thirty-five years longer than someone who was born in the nineteenth century. It is even thought that in the future more and more people will celebrate their hundredth birthdays. Here are some rules for a healthy life.

Get off the sofa!

Sure, it is comfortable to sit on the sofa and watch TV. But doctors say you should get off the sofa. To keep fit, you have to walk at least 10,000 steps every day. In the past, people’s jobs required more physical effort. They often had to walk for miles every day. When farmers were working in the fields, they were keeping fit at the same time. Think about it: Do you get the same amount of exercise today as they did in the past?

Eat healthy food!

It is important to eat food that is fresh and natural, for example, fruit and vegetables. Fast food is not healthy. You should only have it once in a while. Eating too much of the wrong food will harm your health.

Rest while you can!

When we were babies, we slept for much of the night. Teenagers do not need as much sleep as babies, but it is important for you to get about eight hours’ sleep a night. At weekends, you have got more time, so use it not just for your friends, but for rest too.

Do not worry. Be happy!

Many people believe that happiness is important for our general health. Sometimes it is not easy to be a teenager because of the difficulties of school, exams or friendships. If you are worried about something, talk to your parents or your teacher.

One way that scientists learn about man is by studying animals. In this lab, the scientists are studying the relationship（关系）between diet and health.

They are studying the relationship between the amount（数量）of food the mice eat and their health. The mice are in three groups. All three groups get the same healthy food. The first group is eating one cup of food each day, the second group is eating two cups, and the third group is eating three cups.

After three years, the healthiest group is the one that is only eating one cup of food each day. The mice in this group are a little thinner. But they are more active. Most of the day, they are running, playing with one another. Also, they are living longer. Mice usually live for two years. Most of the mice in this group are still alive after three years.

The second group of mice is healthy, too. They are active, but not as active as the thinner mice. They are only living about two years.

The last group of mice gets more food than the other two groups. Most of the day, these mice are eating or sleeping. They are not very active. These mice are living longer than the scientists thought — about a year and a half. But they are not healthy. They are sick more often than the other two groups.