Glucose tolerance is the body’s ability to tolerate glucose. When blood glucose is at a normal level and remains in the normal range for a long period of time, it generally indicates that the reduced glucose tolerance is back to normal. When fasting blood glucose is higher than 7 mmol/L and 2-hour postprandial blood glucose level is higher than 11.1 mmol/L, it indicates that diabetes may be present. Definitive diagnosis requires a combination of clinical symptoms as well as repeated measurements. Hypoglycemia usually occurs with a 2-hour postprandial blood glucose of 7.8 to 11.1 mmol/L, which is a pre-diabetic stage. Through active dietary and exercise adjustments such as low-sugar diet, strengthening exercise, and even medication such as gliclazide, nateglinide, metformin, etc. under the guidance of the doctor, the blood glucose level can generally be lowered to the normal level, i.e., less than 7.8 mmol/L, and if it remains stable for a long period of time, it can be regarded as an indication of the improvement of the situation of hypoglycemic tolerance. Decreased glucose tolerance may be a precursor of diabetes mellitus, therefore, we should be more vigilant, and recommend that you consult a doctor as soon as possible for examination, and then take active treatment after a clear diagnosis.