If the patient always wants to eat, consider the following reasons: 1, diabetes, diabetic patients drink more and eat more, pancreatic function decreases, insulin secretion decreases, nutrients can not be completely absorbed by the body, so the rate of nutrient intake decreases, the need to constantly eat. 2, excessive secretion of gastric acid, excessive secretion of gastric acid is easy to be digested and decomposed food. 3, gastrointestinal peristalsis increases, food in the human stomach to stay shorter than normal. The patient’s appetite is increased by parasitic infection, usually seen in patients with roundworm infection. 5. The patient’s own energy metabolism increases, such as pregnant women and young people who exercise and work more. 6. The patient has bulimia nervosa. 7. The patient has a tumor or other wasting disease.