First, the causes and hazards of childhood obesity obesity is the accumulation of excessive body fat, weight more than the average standard weight of 20% according to the length of the person. Medical weight more than 20% of the average standard weight of children according to the length of the calculation, called pediatric obesity. More than 20-29% for mild obesity, more than 30-49% for moderate obesity, more than 50% for severe obesity. Pediatric obesity is generally considered to be related to the following factors: 1, excessive nutrition too much nutrition to cause caloric intake more than consumption, excess calories in the form of triglycerides stored in the body to cause obesity. Infant feeding improper, such as every time the baby cries, immediately feed milk, long time to develop a habit, after every frustration, want to find something to eat, easy to cause infant obesity, or too early to feed infants high calorie solid food, so that the weight increases too quickly, the formation of obesity. Excessive nutrition in late pregnancy, become the cause of obesity after birth. 2, psychological factors Psychological factors play an important role in the occurrence of obesity. Emotional trauma or psychological disorders such as parental divorce, loss of father or mother, abuse, spoiling, etc., can induce timidity, fear, loneliness, etc., and cause misfits, less activity or to eat for self-entertainment, leading to obesity. 3, lack of activity once the formation of obesity children, because of the mobility, more reluctant to activities, resulting in weight gain, forming a vicious circle. Certain diseases such as paralysis, primary myopathy or serious intelligent backwardness, etc., lead to too little activity, consume less calories, obesity occurs. 4, genetic factors obesity has a certain family genetic tendency. Both parents are fat, 70% to 80% of the offspring appear obese; one of the two parents is obese, 40% to 50% of the offspring appear obese; both parents are not obese, only 1% of the offspring appear obese. Monozygotic twins also have a very high rate of co-morbidity. 5, central regulation factors normal human body exists central energy balance regulation function, control weight relatively stable. Part of the child patient regulation function is out of balance, and cause the body intake too much, more than demand, cause obesity. Second, the harm of children’s obesity traditional concept, especially the elderly think, children are fat nothing, even think that fat is healthy, fat as a symbol of “blessing”. In fact, this is the wrong point of view. Childhood obesity, not only will affect the body shape, more importantly, is the formation of adult obesity disease, hypertension, coronary heart disease, diabetes and other major factors, will bring many potential health hazards. Once children are obese, due to the body fat ratio increased, acid metabolites excretion is not sufficient and the accumulation of increased, children will often feel fatigue, sleepy, reluctant to activities; and because of obesity led to water, sugar, fat metabolism disorders, hyperinsulinemia and abnormal hunger, manifested as a craving and special gluttony. This will easily contribute to the development of children’s inertia, become both gluttonous and sleepy, the formation of more and more fat, the more fat the more vicious circle of problems. The more obese, the more gluttonous, the more lazy, the more reluctant to exercise, the more children lose that innocent and lively and active nature. Children obese, 90% will become big fat after growing up. Obesity will cause children’s sexual development abnormalities, some children will be obese due to sexual development disorders, boys appear cryptorchidism, breast enlargement and other sexual organs and sexual characteristics development disorders; girls appear early sexual maturity or menstrual abnormalities, resulting in their adult sexual dysfunction and reproductive incompetence. Obesity can also affect the development of children’s head shape, appear stupid type tendency. It also tends to grow into X-shaped or O-shaped legs and flat feet. The ability to live independently is reduced, the body resistance is reduced, and it is easy to detain the digestive tract and respiratory diseases. Excessive obesity leads to a decline in the function of the respiratory system, an increase in the concentration of carbon dioxide in the blood, a lack of oxygen in the cerebral cortex, children’s attention is not easy to concentrate when learning, affecting the intellectual development of children. A controlled study of obese and normal children from a psychological point of view found that obese children have an impaired sense of self, low self-esteem, misfit, more anxiety than normal-weight children, and a poor sense of well-being and satisfaction. The degree of this impaired self-awareness increased with obesity. The changes in body size, reduced physical strength and the embarrassing symptoms of obesity cause psychological stress in children, resulting in low self-esteem, isolation and personality disorders, leading to serious psychological developmental disorders in children.