The latest diagnostic criteria for diabetes mellitus are the typical symptoms of “three more and one less” (excessive drinking, excessive urination, excessive eating, and weight loss) plus venous plasma glucose ≥11.1 mmol/L, fasting blood glucose ≥7.0 mmol/L, or 2-hour post-glucose tolerance test blood glucose ≥11.1 mmol/L at any time of the day. Diabetes is diagnosed when one of these three is met. In order to reduce blood glucose, diabetic patients need to adjust their living habits, control their daily diet, eat less and more frequent meals, and strengthen the appropriate exercise to increase insulin sensitivity. In addition, if the patient’s condition is more serious and the blood sugar fluctuates greatly, then you can use some hypoglycemic drugs under the guidance of the doctor, such as metformin, insulin and so on. Diabetic patients should go to the hospital in time to receive examination and treatment, so as not to aggravate the condition.