Diabetic patients should eat less sugar, especially not recommended when blood sugar is high. If diabetic patients have symptoms of hypoglycemia, they should eat sugary food in time, and seek medical treatment for intravenous sugar supplementation in serious cases. Diabetic patients can eat sugar under the premise of blood sugar stabilization, but should be a small amount, otherwise it will cause a significant increase in blood sugar. Diabetic patients in the case of blood sugar is not under control to eat sugar, will make the blood sugar rise too quickly, resulting in patients with metabolic disorders, but also may induce diabetic ketoacidosis and other acute complications. Diabetic patients, especially middle-aged and elderly patients should pay attention to whether there is a hypoglycemic reaction, such as sweating, hunger, trembling, pallor, cold limbs and so on. If there are symptoms of hypoglycemia, they should take oral sugar water and sugary food in time, and seek medical treatment for intravenous sugar supplementation in serious cases. It is recommended that diabetic patients develop good dietary habits in daily life and take hypoglycemic drugs regularly.