The blood sugar one hour after meal should be lower than 9.25mmol/L. After the food enters into the body, through the gastrointestinal tract’s absorption and digestion, all kinds of food are broken down into carbohydrates and water, as the body’s most basic nutrients, participating in various metabolic sites of the human body. The blood sugar in the body will produce a physiological increase, which is normal, as long as the blood sugar does not exceed 9.25mmol/L one hour after the meal. If hyperglycemia occurs, not only postprandial blood glucose will rise, fasting blood glucose will also exceed the normal range, and even affect the sugar and fat metabolism in the body, ketone bodies continue to be deposited, leading to diabetic ketoacidosis, which will cause dizziness, cerebral distension, loss of consciousness, and even nausea, vomiting, atrial fibrillation, which is life-threatening, so strict control of blood glucose helps to maintain the body’s own safety.