Watermelon is a high glycemic index fruit, and diabetic patients should control the amount of watermelon they eat as it will raise their blood sugar, but for non-diabetic patients, eating watermelon will not have much effect on their blood sugar. Diabetic patients should choose low-sugar fruits and try to eat between meals. Watermelon has a high glycemic index and diabetic patients should control the amount of consumption. Citrus, strawberries, apples, pears, grapefruit and other fruits have a lower glycemic index, and can be consumed by diabetics. Non-diabetic patients with normal pancreatic function, eating watermelon will secrete a certain amount of insulin, regulating the body’s blood glucose level, blood glucose will not rise significantly, but should also pay attention to the right amount to avoid gastrointestinal discomfort. It is recommended that diabetic patients pay attention to blood glucose monitoring, diet control and moderate exercise. If there is any discomfort, please consult the doctor in time and treat it actively to avoid delaying the condition.