If the fasting blood glucose 7.0mmol/L is under stress, it can be restored to normal after removing the effects of stress; if the fasting blood glucose 7.0mmol/L is caused by diabetes mellitus, it is necessary to apply medication under the guidance of a doctor to control the diet and exercise moderately, so that the blood glucose level can be controlled within the normal range. There is no uniform data on how long it takes to return to the normal range. 1. Stress: If you are under the effect of stress factors such as surgery, major trauma, serious infection, etc., there will be sympathetic excitation, adrenocorticotropic hormone secretion will increase, resulting in high blood glucose, fasting blood glucose of 7.0mmol/L can be normalized after the removal of stress effects. 2. Non-stress: Diabetes mellitus can be diagnosed when fasting blood glucose ≥7.0mmol/L and symptoms of polyuria, polydipsia, polyphagia, and weight loss are present. Diabetes is a lifelong disease and cannot be cured. It should be managed by diet and exercise under the guidance of a doctor, and combined with medication if necessary. Fasting blood glucose 7.0mmol / L should go to the hospital to further improve the glycated hemoglobin, glucose tolerance test, etc. to determine whether there is diabetes, under the guidance of the doctor’s treatment.