The common symptom of diabetic patients is overeating, which is a feeling of hunger even when they eat more than before, or eat significantly more than people of the same age, sex, or labor intensity. Some patients say that they are always hungry after they get the disease, and they feel hungry even when it’s not time to eat, and they still don’t feel full even if they eat until their stomach is distended. Generally speaking, as people get older, the amount of food will gradually decrease, and the amount of food should be similar for people of similar gender, age and activity. If a person suddenly or gradually increases the amount of food he or she eats, but loses weight and is weak, the possibility of diabetes should be highly suspected. The main reason why diabetic patients eat more is that their bodies do not utilize sugar well. Although the patient eats a lot, but due to the lack of insulin in the body, sugar can not be fully utilized, resulting in intracellular hunger, especially the hypothalamus, the nerve center responsible for hunger and satiety, does not receive sufficient nutrition, the patient will feel hungry, which in turn causes overeating. In addition, in the early stage of the disease, insulin secretion is not yet exhausted, and the insulin level in the body is not only not low, but also may be excessive, but its secretion is delayed, causing pre-meal hunger or even hypoglycemia, which is also one of the reasons why patients are hungry and eat more. The higher the blood sugar of diabetic patients, the more obvious the hunger feeling is, but when the blood sugar is well controlled, the hunger feeling will gradually disappear.