A fasting blood glucose of 5.11 mmol/L in men is within the normal range. Fasting blood glucose generally refers to the concentration of blood glucose measured in the overnight fasting state, requiring at least 8~10 hours without eating any food, the normal range of fasting blood glucose is 3.9~6.1mmol/L, regardless of gender, so men’s fasting blood glucose 5.11mmol/L is within the normal range. If the fasting blood glucose is 6.1~7mmol/L, and at the same time, the 2-hour postprandial blood glucose is less than 7.8mmol/L, then it is impaired fasting blood glucose, and if the fasting blood glucose is greater than 7mmol/L, then it reaches the diagnostic standard of diabetes. If there is an abnormal fasting blood glucose or 2-hour postprandial blood glucose value, it is recommended to go to the hospital, under the guidance of the doctor to determine, clarify the diagnosis and active treatment.