[General knowledge] 1, obesity is caused by a combination of genetic and environmental factors caused by weight gain, fat accumulation caused by excessive chronic metabolic diseases, according to the cause can be divided into simple and secondary obesity two categories. Secondary obesity exists other clear causes such as hypothalamic-pituitary infection, tumor, trauma, cortisolism, hypothyroidism, insulinoma, etc. Simple obesity is only obesity without any organic disease obesity. 2, in recent years, obesity has become one of the three major diseases that endanger human health, obesity and genetic, environmental, dietary and other factors, of which genes are the main determinants. Obesity can lead to diabetes, cardiovascular disease, hypertension, hyperlipidemia and sleep apnea syndrome and a series of diseases, becoming a serious threat to human health and social problems. 3, obesity is usually determined by body mass index (BMI = weight / height 2 = kg/m2), Asian BMI ≥ 23 for overweight, BMI ≥ 25 for obese. Standard weight can also be used to diagnose whether obese, Asian people commonly used standard weight formula: standard weight (kg) = height (cm) – 105, the actual weight more than 20% of the calculated standard weight is judged to be obese, more than 10% and less than 20% for overweight. [Behavior guidance] [Routine prescription] 1, obese patients should first identify whether it is simple or secondary obesity, and then understand whether there are related complications (coronary heart disease, diabetes, cholelithiasis, gout, hypertension and dyslipidemia), so the initial diagnosis should be a comprehensive examination, such as a variety of endocrine hormones (cortisol rhythm, sex hormones, thyroid hormones, insulin, etc.), blood sugar, blood lipids, blood uric acid and liver function. If necessary, liver and biliary ultrasound should also be checked, female patients check the uterus and double adnexal ultrasound. 2, obesity treatment including diet, exercise, drugs and surgery, patients must choose the appropriate treatment plan under the guidance of a specialist, especially the choice of weight loss drugs should be more careful, do not listen to a variety of advertising abuse drugs, because most of the weight loss drugs have side effects, the use of improper causes a variety of complications, and even life-threatening. 3, obesity is a chronic disease, its treatment is also a long-term process, weight loss must follow the principle of gradual progress, to avoid too fast weight loss brought about by debilitating and generalized weakness and other symptoms of the occurrence. To cooperate with the physician, have firm perseverance and strong will, while constantly summing up experience and building confidence that weight loss is bound to succeed. [Diet prescription] 1. Low calorie, low fat, low protein, low sugar, low purine and high vitamin diet. 2, pay attention to cooking methods and meals, eat less or no greasy and fried food. [Exercise prescription] 1, physical activity or exercise lies in increasing energy consumption, the degree of weight loss is related to the frequency and intensity of activity and exercise. The more frequent and intense the activity, the more weight loss. 2, the amount of activity should vary from person to person, in principle, should be taken in a gradual manner. Advocate the use of power, large muscle groups involved in aerobic exercise, such as walking, running, swimming, cycling, etc.. Obese people to the average weekly weight loss of 0.5 ~ 1kg is appropriate.