Diabetic patients with stable blood glucose control can eat watermelon in small amounts, as far as possible between meals; if blood glucose control is unstable for the time being, it is not recommended to eat watermelon. Watermelon is a common fruit, rich in magnesium, vitamin A, vitamin C, carotene, potassium, phosphorus and other nutrients, so for diabetic patients with stable blood glucose control can eat watermelon, which can help to supplement the nutrients, but watermelon contains a certain amount of sugar, do not recommend overdose, otherwise it will cause greater fluctuations in blood glucose. Watermelon has a high glycemic index and is a high GI food, so it is not recommended for diabetic patients with unstable blood glucose control to eat watermelon until their blood glucose control is stabilized. Patients diagnosed with diabetes should actively cooperate with their doctors.