摘要： Read the article again and try to find out key words in each paragraph which convey useful or important information. Paragraph 1: the diet and lifestyle of teenagers, a headache to adults, feel better, look better, have more energy, eat the right food, exercise regularly Paragraph 2: 19%, dieting and skipping meals, control their weight, take in the correct number of calories, exercise regularly, lose weight, keep fit, feel great Paragraph 3: enough calories, girls need 2,200 calories and boys 2,800 calories one day, drink 6 to 8 cups of water a day, keep your system clean Paragraph 4: walking, riding, do school sports, give up on sport, produce chemicals in your blood, make you feel relaxed, increase your ability to concentrate when you study, sleep better at night Paragraph 5: a good amount of sleep, loss of sleep, make you look tried, cause you to put on weight Paragraph 6: follow the suggestions above

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