A two-hour postprandial blood glucose of 5.5mmol/L is generally within the normal range. Two-hour postprandial blood glucose generally refers to the blood glucose concentration two hours after the first meal, if the two-hour postprandial blood glucose is less than 7.8mmol/L is normal; two-hour postprandial blood glucose 7.8~11.1mmol/L, fasting blood glucose is normal is an abnormality of glucose tolerance, is greater than or equal to 11.1mmol/L to reach the diagnosis of diabetes mellitus is one of the criteria. In daily life, both healthy people and diabetic patients are recommended to maintain a low-sugar, low-fat diet and appropriate exercise to help maintain blood sugar stability. If abnormal blood glucose values occur, it is recommended to go to the hospital for consultation.