Obesity refers to excessive accumulation of body fat and/or abnormal distribution and weight gain, which is the result of the combined effect of genetic and environmental factors. Obesity can lead to numerous chronic diseases, such as hypertension, diabetes, hyperlipidemia, coronary heart disease, ischemic stroke, breast cancer, rectal cancer, prostate cancer, fatty liver, gout, sleep apnea syndrome, osteoporosis, etc., which seriously affect the quality of human life, and obesity has Obesity has become a serious public health problem that affects people’s health, so the prevention and treatment of obesity has become a topic of concern worldwide. Obesity can be divided into simple obesity and secondary obesity. No obvious endocrine, metabolic disease cause is called simple obesity, is the most common kind of obesity, accounting for 95%. Simple obesity according to the age of onset and histopathology can be divided into physical obesity and acquired obesity. Secondary obesity has many causes, including hypothalamic disease, pituitary disease, etc. Obesity diagnosis standard: China’s obesity classification standard: BMI>24 for overweight, BMI>28 for obesity; male waist circumference>85 cm, female waist circumference>80cm for abdominal fat accumulation; Chinese adult normal BMI should be 18.5 to 23.9. BMI calculation formula: weight (kg) ÷ height (m) squared, that is, kg/m2.