Diabetes mellitus cannot be cured means that diabetes cannot be completely cured, but it is possible to control blood sugar or achieve diabetic remission through aggressive treatment. Diabetes is a disorder of glucose metabolism caused by insufficient insulin secretion or defective insulin action. If the damage to the pancreatic islet function is mild, it can be recovered through treatment; if the damage to the pancreatic islet function is severe, it cannot be fully recovered. Although diabetes cannot be cured, diabetic patients should receive proper treatment under the guidance of professional doctors. Diabetic patients should control their diet, actively exercise, regularly take hypoglycemic drugs, monitor their blood glucose and maintain stable blood glucose; some obese type 2 diabetic patients can achieve diabetes remission through intensive lifestyle intervention or metabolic surgery. Diabetic patients should be treated under the guidance of their doctors according to their own conditions.