Diabetic patients with low blood glucose before noon meal may be caused by improper diet, high exercise and high dose of medication. 1. Improper diet: After the patient has undergone standardized hypoglycemic treatment, the amount of diet for breakfast is not enough, and low blood glucose before noon meal may occur. 2. Exercise: Patients who exercise too much in the morning but do not lower the dose of hypoglycemic drugs appropriately according to the amount of exercise may also experience this symptom. 3. Higher dosage of medication: Patients with higher dosage of medication may also experience low blood glucose before lunch, and need to consult a specialist in time to adjust the dosage of medication according to the blood glucose level. It is recommended that patients should supplement sugar in time when low blood sugar occurs, and if the symptoms of low blood sugar have not improved, they need to go to the hospital in time to avoid delaying their condition.