Diabetic patients with fasting blood glucose 6.5mmol / L but two hours after the meal blood glucose 17 points more mmol / L may be considered to be dietary factors caused by, but also may not be standardized medication and other factors. 1. Dietary factors: large intake of high-fat, high-sugar foods, such as cakes, sweetened drinks, fatty meats, fried foods, etc., can lead to fasting blood glucose of 6.5 mmol/L but postprandial blood glucose of more than 17 mmol/L. 2. Unregulated medication: unauthorized reduction or discontinuation of insulin therapy, especially for patients who need to inject insulin before meals, if the injection of insulin therapy is not regulated before meals, the lack of exogenous insulin supply in the body after meals will cause an increase in blood glucose, resulting in a fasting blood glucose of 6.5mmol/L but a two-hour postprandial blood glucose of more than 17 mmol/L. Diabetic patients with fasting blood glucose of 6.5mmol/L but 2-hour postprandial blood glucose of 17+ mmol/L are advised to go to the hospital and ask the doctor to give them a proper treatment plan due to the high 2-hour postprandial blood glucose value.