Normally, 2-hour postprandial blood glucose should be less than 7.8 mmol/L, so a 2-hour postprandial blood glucose of 9.1 mmol/L is not normal. The normal range of fasting blood glucose under normal circumstances is 3.9 to 6.1 mmol/L, while 2-hour postprandial blood glucose is no more than 7.8 mmol/L. So a 2-hour postprandial blood glucose of 9.1 mmol/L is not normal because it is beyond the normal range. A postprandial blood glucose of 9.1 mmol/L at 2 hours can be diagnosed as impaired or impaired glucose tolerance. If not treated aggressively, diabetes may develop. It can be regulated by dietary structure, eating less carbohydrate and high-fat food, more fruits and vegetables, and also need to increase physical exercise to control weight. If the postprandial blood glucose does not decrease to below 7.8 mmol/L in 2 hours after lifestyle modification, one should consult a doctor in time to clarify the cause of the disease and take treatment under the doctor’s guidance.