Why are obese children prone to precocious puberty? How to prevent precocious puberty in obese children? Childhood obesity has become an increasingly serious social problem that affects the physical and mental health of children in China. More worrying for parents is that some obese children also early development and precocious puberty. The reason may be: 1, obese children usually eat more than normal children, diet is unreasonable, like to eat snacks, KFC, a variety of meat and fried food, many of them are junk food, not only high calorie content, high fat, and some also added hormones, children if often eat in leading to obesity at the same time, but also promote the early development of the child’s gonads; 2, the United States “Pediatrics” published a study found that Childhood obesity will make girls precocious maturity, because the fatty tissue will prompt the child’s body to produce certain hormones that lead to early puberty, promoting the early sexual maturity of children. According to the Guidelines for the Treatment of Precocious Puberty (for Trial Implementation) issued by the Ministry of Health in 2010, precocious puberty is defined as “the onset of secondary sexual characteristics before the age of 9 for boys and 8 for girls”. The countermeasure to prevent precocious puberty in obese children is to lose weight to reduce the risk of precocious puberty. However, weight loss should not rely solely on dieting and diet pills. Children and adults are different, children’s bodies are in the process of growth and development, need a comprehensive and adequate nutrient supplement, so when children diet, not only fat is consumed, muscle is also consumed at the same time, for organ function will have a negative impact, and even induce malnutrition in children. Weight loss pills also have certain side effects on the growth and development of children. A reasonable diet is undoubtedly the basis of weight loss for children, and a balanced diet is necessary to limit junk food. Secondly, exercise is also the most important way for children to lose weight, the time and intensity of the exercise should be scientific and reasonable, step by step. The children’s precocious puberty is not terrible, as long as we parents do early prevention, rational weight loss, you can avoid the occurrence of children’s precocious puberty. Precocious puberty in children should be distinguished from simple breast development in children, which is a special type of precocious puberty in children and is caused by a transient increase in the level of endogenous and exogenous blood estrogen. It is an isolated, benign, non-progressive disease, often bilateral, sometimes one side develops before the other, but there is no nipple and areola development, no development of secondary sexual syndromes other than breast development, and the uterus and ovaries are normal on ultrasound examination, and there is no internal genital development. Children with simple premature breast development generally do not need treatment, try to avoid using cosmetics containing sex hormones, and eat less junk food and nutritional supplements.