For the elderly, type 2 diabetes has a common factor with coronary heart disease, hypertension and hyperlipidemia, which is “hyperinsulinemia”. Therefore, patients with these diseases also need to prevent the occurrence of type 2 diabetes. Patients who are fat (especially abdominal obesity, also called “apple-shaped” obesity), have a family history of diabetes, have had hyperglycemia or have been diagnosed by doctors as “pre-diabetic” are all at high risk for type 2 diabetes. In daily life, the prevention of diabetes should start with the following points: 1. Regular monitoring of blood glucose In general, the elderly should have a comprehensive checkup once a year, and the terminal blood glucose should be monitored once every 1-2 months. Not only should fasting blood glucose be monitored, but also the 2-hour postprandial blood glucose should be checked. This is because some patients with type 2 diabetes mainly show a significant increase in blood glucose 2 hours after meal due to delayed insulin release. If only fasting blood sugar is checked, the diagnosis may be missed. 2. Lifestyle interventions The occurrence of type 2 diabetes can be significantly delayed or prevented by diet control and appropriate exercise in people with high risk of type 2 diabetes. The purpose of diet control and appropriate exercise is to maintain the ideal weight and body shape. The specific goals are: (1) to make the body mass index (weight kg/height m2) of obese or overweight people reach or approach 24 kg/m2, or to reduce body weight by at least 5-10%; (2) to reduce the total daily dietary calories by at least 400-500 kcal; (3) to increase physical activity to 250-300 minutes per week. 3, pay close attention to the treatment of cardiovascular diseases Patients who already suffer from hypertension and coronary heart disease should make their blood pressure and blood lipids reach the standard as much as possible. When applying antihypertensive drugs, use antihypertensive drugs that have the effect of improving insulin resistance, such as ACEI (angiotensin-converting enzyme inhibitors, such as Lodinin, etc.) class and ARB (angiotensin II receptor antagonists, such as Dynavin, etc.) class, as much as possible. According to experimental studies, ACEI and ARB can reduce the proportion of patients with new-onset diabetes. In addition, it is also necessary to avoid the use of drugs that affect the stability of blood sugar, for example, Shoubisan, diuretics such as dihydrochlorothiazide, which has a good effect of lowering blood pressure, but it increases blood sugar while reducing blood volume, so it should be avoided.