Pre-meal blood glucose in diabetic patients generally refers to random blood glucose, and the normal value of random blood glucose ranges from 3.9 to 11.1 mmol/L. It is recommended that diabetic patients monitor fasting blood glucose and 2-hour postprandial blood glucose on a regular basis. If the patient’s random blood glucose level is ≥11.1mmol/L, and at the same time there are symptoms such as excessive drinking, excessive eating, excessive urination, weight loss, etc., then it is considered to be caused by diabetes, which needs to be paid attention to, and go to the hospital in time for relevant examinations to clarify the diagnosis, and standardize the treatment under the guidance of the doctor as soon as possible. If diagnosed with diabetes, patients should eat more protein- and vitamin-rich foods, such as lean meat, eggs, oats, cucumbers, etc., and avoid diets high in sugar. Patients should also follow the doctor’s instructions for treatment to avoid affecting their health.