A two-hour postprandial blood glucose of 5.7 mmol/L is normal. The two-hour postprandial blood glucose measurement is the blood glucose concentration measured two hours after eating a meal, and the normal range should be less than 7.8mmol/L, so the two-hour postprandial blood glucose of 5.7mmol/L belongs to the normal range. If the postprandial blood glucose is 7.8~11.1mmol/L, it is impaired glucose tolerance, and greater than or equal to 11.1mmol/L has reached the diagnostic standard of diabetes mellitus. Besides, the normal range of fasting blood glucose is 3.9~6.1mmol/L. In daily life, both healthy people and diabetic patients should maintain a healthy lifestyle and follow a low-salt, low-sugar and low-fat diet, which can help to keep blood glucose stable. If abnormal blood glucose value occurs, it is recommended to go to the hospital for consultation.