The 2-hour postprandial blood glucose 8.4mmol/L can be treated in the following ways: dietary adjustments, appropriate exercise, medication and so on. 1. Dietary adjustment: the normal value of 2-hour postprandial blood glucose is <7.8mmol/L, 8.4mmol/L belongs to glucose tolerance abnormality, you can first carry out dietary adjustments, try to eat less high salt, high sugar, high fat food, eat more vegetables, supplement high quality protein food, avoid smoking and alcohol stimulation, reduce the amount of staple food, eat more vegetables, and develop a healthy eating habit. 2. Appropriate exercise: Exercise can promote energy metabolism and help regulate blood sugar. You can take fast walking, jogging, doing exercises, swimming, 30 minutes each time, 5 times a week. Or make appropriate adjustments according to your own situation. 3. Medication: If diet and exercise interventions are poor, and long-term postprandial blood glucose is high, there is a possibility of progression to diabetes. If necessary, you can use hypoglycemic drug treatment under the guidance of clinicians, such as: metformin, etc. The occurrence of high blood sugar 2 hours after meals must be taken seriously, and if necessary, seek medical treatment, so as to avoid the development of the disease, which will adversely affect the health of the body.