The prevention of diabetes can be carried out by adjusting lifestyle and strengthening diabetes screening, and there is no such thing as the best way. 1. Adjustment of lifestyle: mainly in diet, we should develop reasonable eating habits, pay attention to controlling the intake of calories, and eat more meals with less food. In addition, moderate exercise, maintain normal body weight, quit smoking and limit alcohol, etc., all help to prevent diabetes. 2. Enhance the screening of diabetes mellitus: Especially for people with high risk of diabetes mellitus (e.g. age ≥40 years, BMI ≥24, family history of diabetes mellitus, hypertension, cardiovascular and cerebral vascular lesions, etc.), simple glucose tolerance (i.e., fasting, 75g of anhydrous dextrose for 2 hours) is generally used for screening, and early intervention should be implemented once impaired glucose tolerance (IGT) or impaired fasting glucose (IFG) is found. Diabetes mellitus is a metabolic disease whose etiology and pathogenesis are not well understood, but active prevention can help reduce the incidence of diabetes mellitus.