Fasting blood glucose 6.9mmol/L may or may not be able to return to normal. Clinically, the normal value of adult fasting blood glucose is 3.9-6.1mmol/L, and the normal 2-hour postprandial blood glucose should be less than 7.8mmol/L. Fasting blood glucose value between 6.1-7.0mmol/L belongs to the impaired fasting blood glucose, so it can be diagnosed as the impaired fasting blood glucose when fasting blood glucose is 6.9mmol/L. Impaired fasting blood glucose belongs to pre-diabetes, patients with high fasting blood glucose can control their blood glucose by controlling their diet and weight, and it is possible to return to normal. But it is also possible that through diet control, exercise and exercise, etc., it can not return to normal and further develop into diabetes. Patients with high fasting blood glucose should avoid high sugar food in their daily diet, and focus on fresh vegetables, coarse grains and other foods in their diet, and they can exercise appropriately to control their weight. At the same time, it is recommended that patients with abnormal fasting blood glucose actively consult a doctor and follow the doctor’s instructions for treatment.