In the UK, most children have their lunches at school, but in some schools, parents can choose what their children eat. The children can have a school dinner — a hot, cooked meal; or they can take a packed （包装的）lunch with them, which usually includes cold food like sandwiches.

Often parents know what their children want. Cath, a mother of three children, told us, “My children have packed lunches because they say they hate school dinners. So I make three packed lunches every morning.”

However, another mother, Susan, made a different choice. She said, “My daughters have always had school dinners. I think they probably get healthier food at school than a few sandwiches I make for them.”

But how healthy are school dinners? Kaz, a father, thought poorly of them. He said, “Fizzy (起泡的) drinks were offered and I think there were lots of chips.”

Jamie Oliver spent a year working in a school kitchen. He was worried about the unhealthy food which included burgers, pizzas and chips. So he tried to cook healthy food such as good stews(炖肉) and curries (咖喱菜肴) for the children instead.

So Jamie improved the school dinners, and trained the dinner ladies to cook healthy food in that school. Then he advised the government to improve school food across the country. And it seems that the changes have begun.

Anna, a pupil, told us, “we used to have a fast food window where you got chips and coke, but they stopped that this year. There’s salad restaurant, which is good, so it’s healthier than it was.”

Scientists are studying different foods, and they will see which foods protect us from cancer(癌症), and which cause it. It is known that a healthy diet(饮食) will help keep a healthy body weight, which can also decrease the risk(风险) of many types of cancer.

Fruit and vegetables are an important part of a healthy diet. They can decrease the risk of some cancer types like mouth and throat cancer. They are a good source of many important nutrients such as vitamin A, vitamin C, vitamin E, and are an excellent source of fiber.

Try to get plenty of fruit and vegetables in your diet. Eating fruit and vegetables with a variety of colors will help you get many kinds of vitamins and minerals, as the chemicals that give these foods their colors are good for you.

Eating lots of red and processed meat can increase(增加) your risk of stomach cancer. Red meat includes all fresh and frozen beef, pork and lamb. Processed meat includes ham, bacon and sausage. White meat, such as chicken, is unlikely to increase your risk of cancer.

Eat smaller and fewer parts of red and processed meat. Try using beans or peas instead of meat in your diet. When you cook meat, use low-temperature methods.

Fat is a necessary part of our diet but high-fat diet can increase our risk of cancer, heart disease and other diseases. Meat is higher in saturated fat(饱和脂肪) and eating too much saturated fat may increase your risk of breast cancer.

Try not to eat too much fatty foods. In particular, try to cut down on saturated fat contained in fatty meat, biscuits, and butter. Try to avoid frying foods in lots of oil.

Good health is the most valuable thing a person can have, but one cannot take good health for granted. It is important to remember that the body needs proper care in order to be healthy. There are three things that a person can do to help stay in good: eat right food, get enough sleep, and exercise regularly.

Proper nutrition is important for good health. Your body cannot work well unless it receives the proper kind of “fuel”. Don’t eat too much food with lots of sugar and fat. Eat plenty of foods high in protein, like meat, fish, eggs and nuts. Vegetables and fruits are very important because they provide necessary vitamins and minerals. However, don’t overeat. It is not helpful to be overweight.

Getting the proper amount of sleep is also important. If you don’t get enough sleep, you feel tired and easily get angry. You have no energy. Over along period of time a little amount of sleep may even result in a change of personality. Be sure to allow yourself from seven to nine hours of sleep each night. If you do, your body will feel strong and refreshed, and your mind will be sharp.

Finally, get plenty of exercise. Exercise firms the body, strengthens the muscles, and prevents you from gaining weight. It also improves your heart and lungs. If you follow a regular exercise program, you will probably increase your life-span Any kind of exercise is good. Most sports are excellent for keeping the body in good shape: basketball, swimming, bicycling, running and so on are good examples. Sports are not only good for your body, but they are enjoyable and interesting, too.

If everybody were to eat the right foods, get plenty of sleep and exercise regularly, the world would be a happier and healthier place. We would all live to be much older and wiser.