A 2-hour postprandial blood glucose of 5.7 mmol/L is generally normal, but it is necessary to pay attention to both fasting blood glucose and random blood glucose in order to accurately determine. The fasting blood glucose of a healthy person is 3.9~6.1 mmol/L, and the two-hour postprandial blood glucose is <7.8 mmol/L. The patient's 2-hour postprandial blood glucose of 5.7 mmol/L is in the normal range, and if the patient's fasting blood glucose is also in the normal range and there are no other diabetic symptoms, it generally indicates that it is normal. However, if the two-hour postprandial blood glucose is normal and the fasting blood glucose is elevated, there may be impaired fasting blood glucose or diabetes mellitus, so the monitoring of blood glucose needs to pay attention to both fasting blood glucose and two-hour postprandial blood glucose. In daily life, you can avoid eating fried, high sugar foods, such as fried chicken, potato chips, cakes, cookies, etc., and actively engage in physical exercise to maintain a healthy weight, which can effectively prevent the occurrence of diabetes. Seek prompt medical attention if you find abnormal blood glucose levels.