The main reason for dieting and losing weight without defecation and only farting is that the patient does not eat or the amount of food eaten is drastically reduced causing a decrease in stool, but the gas in the intestine is normally present and can be expelled normally resulting in. As the structure of the diet returns to normal, the bowel movements will also return to normal. Dieting for weight loss can cause a series of adverse effects on the body, and patients are generally not advised to use dieting to lose weight. Dieting to lose weight can lead to insufficient intake of high quality protein, which can affect the decline of body functions, with manifestations such as dull skin, easy aging, metabolic disorders and endocrine disorders. If the body is not enough vitamin A, it is easy to cause gastrointestinal and urinary system infections, and even affect the normal function of the reproductive system. Insufficient vitamin B in the body will reduce carbohydrate and fat metabolism, more likely to lead to obesity. In addition, long-term dieting will stimulate excessive secretion of gastric acid and damage to the gastric mucosa, which can easily lead to gastric and duodenal ulcers, chronic gastritis and other stomach diseases. Therefore, weight loss should avoid the diet, can adjust the healthy diet structure in daily life, regular diet, less snacks, fried, high sugar content food, such as cake, fried chicken, cola, etc., eat more vegetables rich in dietary fiber, such as celery, spinach, broccoli, etc., can be supplemented by the intake of beef, chicken, fish, eggs and other foods with high quality protein. Develop a good habit of regular exercise, not only to promote bowel movements and relieve constipation, but also to achieve weight loss through a healthy way.