From a medical point of view, obesity is an excessive increase in body fat that poses a serious health risk. We consider obesity as a disease, not just a symptom, so here we call it “obesity disease”. The normal human body has about 30 to 35 billion fat cells, and obesity is formed when the number and size of fat cells increase. As the body weight increases, the size of fat cells first increases, and then the number starts to increase. It is not only the increase of cell volume that people generally believe. At present, the diagnosis of obesity mostly uses the method of body mass index (BMI), body mass index is a more accurate and widely accepted and adopted by the world diagnosis method. You can enter your weight (kg) and height (m) on the home page of this website, then click “Calculate”, the system will display your body mass index and give you the diagnosis result. Body mass index (BMl) = weight (kg) / height m2 standard weight (kg) = (height cm – 100) x 0.9 The following lists the relationship between “body mass index” and “health risks”, in China the diagnosis of obesity is more than 25 BMI, the World Health Organization’s standard is that BMI more than 25 is overweight, more than 30 is obese. In the diagnosis of obesity, the ratio of waist circumference to hip circumference (WHR) should also be considered, WHR more than 0.9 is not good for health. Obesity (syndrome) can be divided into two categories: simple and secondary, the former is considered to have no obvious cause, the latter refers to secondary to other diseases (such as thalamic-pituitary tumors, endocrinopathies, nutritional disorders, etc.) caused by. In addition to genetic and certain endocrine factors, simple obesity is also associated with excessive eating and low activity. Human ingestion activity is regulated by two factors, one is the physiological regulation factor, such as the contraction of the stomach to provide hunger, stomach fullness to provide saturation, etc. The other aspect is the psychological, social and cultural factors, including socio-economic status, awareness of food and obesity, evaluation, attitude, interpersonal relationship and emotional condition, etc. These factors can also affect the amount of physical activity of people, thus becoming the main reason for simple The main cause of obesity. In some ethnic groups, obesity is taken as a symbol of wealth and beauty, a sign of career success. And many studies in the West show that people at the bottom of society and with little financial income suffer more from this disease. Obesity or overweight, and genetics, disease diet and lifestyle, especially habits and lifestyles are closely related. Emotional factors have a significant impact on food intake activities. As the saying goes, “a broad mind and a fat body” means that an open mind and positive emotions will make people fit and fat, but this is only one aspect of the problem. Many studies have proven that psychological stress and various negative emotional reactions such as anxiety, fear, anger, depression can also drive people to eat more. It is hypothesized that these people may have some degree of personality defects and that emotional distress must be relieved by eating, thus creating an emotional dependence on ingestion as a means of satisfying their need for security and self-esteem. Overeating serves these purposes because these individuals are unable to distinguish between hunger and other psychophysiologically activated states. Obesity can also be a negative stimulus for patients, and so many people (especially women) experience a variety of negative psychological reactions to obesity, including low self-esteem, mood disorders, and devaluation of their own image. These psychological reactions and the resulting behavioral withdrawal, reduced physical activity and overeating, in turn, can increase the degree of obesity. Obesity is more common among women than men, and increases exponentially among women after middle age. Therefore, women should not delay weight loss until menopause. The disease can lead to many troublesome complications, such as difficulty in breathing, hyperventilation, shortness of breath when moving, etc. Due to the increased weight, the load on the skeletal system increases, and there is often back pain, lower limb edema, and knee and ankle osteoarthritis. Patients above middle age have significantly higher than normal complications such as hypertension, diabetes, arteriosclerosis, gallstones, menstrual disorders, etc. Even in adolescents, there are also obesity-induced diseases mentioned above. For the treatment of obesity, the first thing is to find out the cause of the disease. Those who are caused by other diseases should actively treat the original disease. Those who are caused by emotional factors can carry out psychological treatment, the focus of which is to eliminate the patient’s negative emotional reaction and personality problems, and train the patient to learn to recognize the signal of satiety and implement the weight loss plan. Obese people generally eat a lot and have little activity. Therefore, the principle of weight loss is to reduce the intake of caloric food and increase the consumption of calories in a two-pronged way. In addition, it is necessary to focus on physical exercise and increase the amount of exercise. As for a variety of diet tea, diet creams, nutrients and other weight loss products, can not solve the fundamental problem. Even if the obesity caused by endocrine diseases (such as hypothyroidism, cortical increase, and pituitary lesions) should be treated with drugs for different diseases, but also from the dietary habits and lifestyle regulation, in order to lose weight and achieve the purpose of weight control. Obese people must change the past bad eating habits. Such as see good eating and drinking, eat snacks, sweets and animal fat food, change to a small amount of multiple meals, so that the body economy to maintain a semi-starvation state, not to cause fat accumulation. Eat less or forbid sweets and do not snack. But weight loss can not rely solely on dieting, that may lead to anorexia nervosa, causing malnutrition and even death.