Snacks are generally not recommended for patients with high blood sugar because most of them are high in sugar and fat, and consuming them in large quantities is not conducive to blood sugar control. However, patients whose blood sugar remains stable for a long time can eat some low-fat and low-sugar snacks appropriately. Dietary therapy is the basis of treatment of diabetes mellitus. Snacks are usually not recommended for diabetic patients with poor glycemic control because of the need for strict control of daily dietary intake, which is generally given to normal-weight adults in resting condition at 20~25 kcal/kg, light physical labor at 25~30 kcal/kg, moderate physical labor at 30~35 kcal/kg, and heavy physical labor at 40 kcal/kg. However, diabetic patients with stable blood glucose control can eat appropriate low-fat and low-sugar snacks, such as sugar-free yogurt and oats. Snacks are also part of the daily intake. Patients who choose to eat some snacks need to reduce their three meals accordingly to maintain a stable daily intake. Patients with hyperglycemia are advised to monitor their blood glucose level regularly and make reasonable dietary arrangements under the guidance of their doctors.