Diabetes is not exactly the same as high blood glucose. High blood glucose definitely exists in diabetic patients, while high blood glucose is not necessarily a diagnostic criterion for diabetes, which is a diagnosis when blood glucose is elevated to a certain level. The fasting blood sugar of normal people is between 3.8-6.0mmol/L, when fasting blood sugar is between 6.0-7.0mmol/L belongs to fasting blood sugar is too high. When fasting blood glucose is greater than 7.0mmol/L, diabetes can be diagnosed. In normal people, the 2-hour postprandial blood glucose is less than 7.8 mmol/L. When the 2-hour postprandial blood glucose is between 7.8 and 11.1 mmol/L, it is abnormal glucose tolerance. Diabetes can also be diagnosed when the 2-hour postprandial blood glucose is greater than 11.1mmol/L. Therefore, diabetes is diagnosed when blood glucose is elevated to a certain degree. Although normal people with elevated fasting or postprandial blood glucose are not necessarily diagnosed with diabetes, they need to be treated with diabetic diet and exercise to avoid the development of diabetes.