Overeating: a dangerous mental illness. If you suddenly and obviously overeat for no reason, you may suffer from a mental illness called bulimia nervosa. Bulimia nervosa refers to paroxysmal and irresistible appetite and behavior. A large amount of food can be ingested in one meal, and weight gain can be offset by vomiting, catharsis, diuresis, fasting or excessive exercise after meals. The prevalence rate of women is 1% ~ 3%, that of men is about110, and the average age of onset is 18 ~ 20 years old. The etiology of bulimia nervosa is not clear, which may be related to many factors. Genetic factors and biochemical abnormalities, such as 5- hydroxytryptamine dysfunction and decreased release of 5-HT in hypothalamus, can cause overeating symptoms. The more women who experience mental stress, the higher the risk of overeating. A series of measures taken by modern women in pursuit of slimness can not only suppress their appetite, but also have the opposite effect, which is manifested as overeating. The main feature of this disease is paroxysmal overeating. When gluttony attacks, the appetite increases greatly, eating more and faster, and even eating several times the amount of ordinary people at a time until it is unbearable. At the beginning, the parties were shy about overeating and secretly carried it out, which was often accompanied by emotional changes, such as anxiety and depression, which were mostly related to changes in weight and body shape. Patients pay too much attention to body shape and are often dissatisfied with themselves. After overeating, people feel disgusted, guilty and worried, and some of them have suicidal thoughts and behaviors. The frequency of seizures varies, and most people have seizures several times a week. In order to offset the weight gain caused by overeating, patients often take various measures to increase excretion, reduce absorption or excessive exercise, such as vomiting after meals, catharsis, taking diuretics and diet pills, reducing food intake or fasting. During the interval between attacks, most of them have normal appetites, and only a few have decreased appetites. Most patients can control their weight, and their weight is normal or slightly increased, and those less than 1/4 lose weight. Gluttony often significantly affects the social and professional functions of patients. The bulimia symptom of bulimia nervosa is a dangerous behavior pattern, which can lead to neuroendocrine regulation disorder and seriously damage the functions of various organs. Self-induced vomiting and catharsis are more dangerous and may die of complications such as gastrointestinal bleeding. The goal of treatment is to restore nutritional status and rebuild normal eating behavior, and to break the vicious circle of physiological and psychological sequelae caused by malnutrition, persistent eating disorders and bad behavior patterns. The treatment plan includes the recovery of nutritional status, drug therapy and psychotherapy. Antidepressants have a certain effect on bulimia, and fluoxetine, trazodone, imipramine and norimipramine can alleviate the symptoms of bulimia and improve anxiety and depression. Carbamazepine and lithium carbonate are effective for bulimia. The dosage of the above drugs is similar to the treatment of mood disorders. In addition, low-dose haloperidol is effective for some patients. The above drugs should be used under the guidance of a doctor to avoid adverse reactions. Psychotherapy includes cognitive behavioral therapy, psychoanalysis and family intervention to change patients' inappropriate views on body shape and weight, improve depression, reduce overeating and establish correct behavior patterns. At present, little is known about the natural course or long-term results of bulimia nervosa. However, some data show that among the untreated patients, 25% ~ 35% of the patients' symptoms spontaneously relieved after 1 ~ 2 years; After regular treatment, 50% ~ 90% of the patients' condition was relieved. The longer the course of disease, the worse the prognosis.