Eat not fat body thin may be genetic factors affecting the physical wasting, individual metabolism is fast, while pregnancy, lactation, growth and development and other cases need a lot of nutrition, at this time, as long as you maintain a normal balanced diet. When the patient’s weight is less than 10% of the standard weight is wasting, it may be related to the following factors: 1, inadequate nutritional intake: is due to a variety of factors that cause the patient can not eat normally, supplementation of nutrition caused by wasting, on the one hand, the patient itself is a picky eater, anorexia, irregular meals, irregular life, overwork, mental tension, staying up late, etc. On the other hand, due to oral ulcer, tonsillitis, mandibular arthritis, esophagitis, esophageal cancer and other factors, causing patients to have difficulty in eating, swallowing and insufficient nutritional intake; 2, nutritional absorption disorders: common intestinal tuberculosis, chronic gastritis, gastric-duodenal ulcer, chronic hepatitis, chronic pancreatitis and other gastrointestinal disorders, causing patients to have spleen and stomach dysfunction and reduced absorption and utilization of nutrients, which in turn leads to emaciation 3, excessive nutritional consumption: hyperthyroidism, diabetes and other metabolic diseases, as well as tuberculosis, leukemia, malignant tumors and other consumptive diseases, often require a large number of nutrient supply consumption, so patients will eat more but do not grow fat, or even wasting. Patients who are generally wasting can go to the hospital for blood sugar, thyroid function, tumor index examination, or even need to do gastroscopy, chest and abdomen enhanced CT examination to clarify the specific causes and then consider whether they need to carry out systematic treatment.