(1) genetic parents have one is obese, its children obese chance for 40% to 50%; parents are obese, its children obese chance for 70% to 80%. (2) eating habits If parents allow their children to eat high-fat and high-calorie food, and often want them to eat all the food provided, and even to reward the way to encourage children to eat, easy to make children become obese. Children away from obesity how to regulate diet? (3) psychological compensatory effect when children are psychologically disturbed, nervous or frustrated, will find sweet, high-calorie food, to constantly eat to fill the psychological disturbed, develop the habit of eating too much. (4) Taking medications Such as anti-allergy medications, sex hormones, steroids, antidepressants, anti-seizure medications, etc. (5) Physiological factors It may originate from the patient’s own more hyperactive metabolism, endocrine disorders, chromosomal abnormalities, uncontrolled brain control of the satiety and hunger center or diseases. According to the characteristics of children’s growth and development, children have two periods that are prone to obesity: one is infancy, and the other period is the stage from 5 to 10 years old. In these two periods, all exist at the same time fat cell quantity increase and fat cell volume increase two processes. Only in infancy the increase in the number of adipocytes is dominant, while in childhood the increase in the volume of adipocytes is dominant. The number of adipocytes that increases in both periods does not decrease later in a person’s life. Therefore, in these two periods are rapidly obese children, later if excess nutrition, so that fat cell volume increases, are likely to present obesity.