Diabetes mellitus is a group of metabolic diseases characterized by hyperglycemia. Hyperglycemia, in turn, is caused by defective insulin secretion or its impaired biological action, or both. There are 415 million diabetic patients worldwide, and China has more than 100 million patients, accounting for a quarter of the world, but the national awareness rate of diabetes is only 36.5%, and the treatment rate is only 32.2%. Therefore, the only goal of most patients is to control blood sugar, thinking that as long as the blood sugar is well controlled, there will be no worries, but this is not the case. This is the main cause of death and disability in diabetic patients. Most diabetic patients die at an advanced stage because of complications. Diabetes can cause a series of complications, such as retinopathy, chronic kidney failure, liver disease, various infections and tumors, and a series of cardiovascular diseases. Once these diseases appear, they can be fatal to the health of the patient. According to the survey, the main complication that causes death in diabetic patients is cardiovascular lesions. When cardiovascular lesions occur, they cause headache, chest tightness and symptoms of hypertension and hyperlipidemia, which can easily lead to stroke and heart attack, posing a great threat to patients’ life safety. In addition, there are also acute metabolic disorders that can cause death, such as ketoacidosis, non-ketotic hyperosmolar coma and lactic acidosis, which can also cause death. How should diabetes be prevented? 1. Develop good living habits. A proper diet and a good lifestyle can minimize the incidence of diabetes. Diabetes is a non-communicable disease, although there are certain genetic factors at play, but the key role is played by acquired life factors and environmental factors. 2. Regular blood sugar measurement. Blood glucose measurement should be included in the routine medical checkup for middle-aged and elderly people. Anyone who has traces of diabetes, such as abnormal skin sensation, reduced sexual function, poor vision, polyuria, cataracts, etc., should be measured and carefully identified in time to make early diagnosis and gain valuable time for early treatment. 3, early detection of complications. Diabetic patients are easy to complicate other chronic diseases, and easy to endanger life due to complications. Early prevention is its main point, late treatment is not effective. Early diagnosis and early treatment can often prevent the occurrence of complications, so that patients can live a long-term life close to normal.