Blood glucose 7.9 that is, blood glucose concentration of 7.9mmol / L, its seriousness depends on the specific population, the general population and diabetic patients are judged differently, most of them belong to the high level, more serious, need to be actively diagnosed and treated. Clinically, the normal value of fasting blood glucose for healthy adults is 3.9~6.1mmol/L, and the value of 2-hour postprandial blood glucose is 4.4~7.8mmol/L; diabetic patients’ fasting blood glucose needs to be controlled at 4.4~7.0mmol/L, and the value of 2-hour postprandial blood glucose needs to be controlled at ≤10mmol/L. 1. General population: If the fasting blood glucose of general population is 7.9mmol/L, it is highly suspected to have diabetes, and it is necessary to consult the doctor in time to continue to improve the 2-hour postprandial blood glucose value check and glycated hemoglobin value; if the 2-hour postprandial blood glucose value of general population, it is possible to consult the doctor after several times of testing and improve the life style to control the blood glucose. 2. Diabetic patients: For diabetic patients who have been diagnosed, if the fasting blood glucose is 7.9mmol/L, it is abnormal, and it is necessary to repeat the consultation to find out the reason and adjust the glucose-lowering program; if the 2-hour postprandial blood glucose value is 7.9mmol/L, it is normal, and it is recommended to continue to carry out rigorous self-monitoring. After determining that there is high blood sugar, consult a doctor in time, control the diet under the doctor’s guidance, avoid the intake of high-calorie food, and at the same time, participate in physical exercise, and if necessary, carry out glucose-lowering treatment.