Staying alive and being healthy don't happen all by themselves. We have to do some things to make sure we stay well. Look at this table of contents from Joy Wilt's book called KEEPING YOUR BODY ALIVE AND WELL, and then answer the questions that follow.

If you go to a fast food restaurant, you will probably see a lot of teenagers (青少年). Today, many teenagers are becoming fat, and this is because of their bad eating habits. Most teenagers love food with a lot of fat, oil, salt and sugar. People often call this kind of food “junk food”.

But bad eating habits go beyond fast food. We find many teenagers don’t have a good eating habit. Some don’t have breakfast before they go to school. During the day, some don’t have a healthy meal for lunch. In a recent survey (调查) at one school, scientists found that over two thirds of the students didn’t like a healthy diet (饮食). They didn’t like vegetables and many of them didn’t like fruits. They liked to eat food with a lot of salt, sugar, or fat better.

Parents today also worry about their children’s diet. Some doctors give the following advice:

Teenagers shouldn’t eat too much junk food.

Teenagers shouldn’t eat food with too much salt. Salt can cause high blood pressure (高血压) in the future.

Teenagers should eat food with less fat, oil, and sugar.

Teenagers need to eat some fruit and vegetables every day. Fruit and vegetables are rich in vitamins (维生素) and have little fat.

Teenagers need to drink more milk. Milk will help their bones (骨骼) grow.

Teenagers need to eat breakfast every day. This is good for their bodies and mind.

Do you eat healthy foods every day? Do you know the secret of healthy foods? Gregg Segal is from the US. He takes photos of foods. And he wants to use them to tell people the secret (秘密) of healthy foods.

Many fruits and vegetables have a beautiful color. And their colors can help us keep healthy. Green is good for our eyes. And it gives us strong teeth. Blue and purple help us remember things well. They are good for our eyes, too. Red can help our hearts (心脏) keep healthy. Yellow and orange give us much Vitamin C.

Segal said, if you want to eat packaged(包装) foods, look at the ingredients list(成分表) first. Don’t eat packaged foods with more than five ingredients.

Gregg Segal also asked people to write down everything they eat or take photos of their foods. That way, people can know how many kinds of healthy foods they eat.