According to data from the Center for Disease Control and Prevention in China, the number of obese people under the age of 18 in China has reached 120 million; foreign studies point out that 12% of children in China are overweight, and the proportion of Chinese adolescents suffering from diabetes is four times higher relative to their peers in the United States. Youth obesity and its parents have a great relationship, parents because of busy work can not take care of their children’s diet, long-term unreasonable family meal structure (breakfast is too simple, can not meet the needs of children’s growth and development; dinner is too rich, forcing the stomach and intestines to work overtime, affecting children’s sleep in addition to easily lead to the accumulation of nutrients in the intestine, leading to obesity.) And unhealthy eating habits (love to eat fast food, “junk food” intake too much, love drinks, etc.). In addition, today’s adolescents do not exercise much, are addicted to online games, watch TV and other static activities for too long, do not participate in outdoor sports. How to prevent adolescent obesity is urgent. 1.Change the family meal structure As the saying goes, “the plan of the day lies in the morning”, breakfast should be plentiful and diversified; dinner should be chewed slowly and keep eight minutes full; in addition, it is also necessary to improve the intake of trace elements; balanced food coarse and fine; eliminate excessive cooking. 2.Cultivate healthy eating habits Excessive or unbalanced nutrition is the most important factor leading to adolescent obesity. Promote scientific diet, less dining out, family cooking should be less oil and salt; less junk food; more fruits and vegetables, less fatty meat; more plain water, less drinks; more coarse food, less refined food. 3, strengthen physical exercise Some teenagers are obese mainly because of the lack of exercise, should increase the amount of exercise and exercise time, so as to consume excess body fat. Parents set an example by accompanying children to participate in outdoor activities such as running, climbing, cycling, etc., so that children can develop the habit of exercise. Adolescents who are obese are prone to try unhealthy weight loss methods, such as fasting or diet pills, but this can lead to a vicious cycle of more weight gain. It is not advisable to lose weight blindly, and medical advice needs to be followed.