People with diabetes can be both fat and thin. The fatness of people with diabetes is related to the type of diabetes and the degree of insulin deficiency. Insulin is a pro-synthetic hormone that can promote the synthesis of protein, fat and glycogen and inhibit the breakdown of protein, fat and glycogen. if a diabetic patient has severe insulin deficiency, the diabetic patient will be thin, and if the diabetic patient has insulin resistance, the patient will be obese. type 1 diabetes is mostly juvenile onset, with insulin deficiency as the main cause, and may have pancreatic beta cell failure, and treatment mainly relies on insulin. Type 2 diabetes has both insulin resistance and insulin deficiency, especially type 2 diabetes of short duration, which is mainly insulin resistance and obese body type. Obesity is the basis for the occurrence of insulin resistance, and insulin resistance can easily lead to abnormal glucose metabolism and even diabetes. Type 2 diabetes of long duration has poor pancreatic islet beta cell function and can also be characterized by wasting.