A, too much nutrition to the intake of calories more than the consumption, excess calories in the form of triglycerides stored in the body to 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. Second, 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. Third, the lack of activity children once obesity formation, because of the mobility, more reluctant to activities, so that the weight increases day by day, forming a vicious circle. Certain diseases such as paralysis, primary myopathy or serious intelligent backwardness, etc., lead to too little activity, reduce the consumption of calories, obesity occurs. Fourth, 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. Fifth, the central regulation factor normal human body exists central energy balance regulation function, control weight relatively stable. This disease patient regulation function is out of balance, and cause the body intake too much, more than demand, cause obesity.