Eating watermelon will raise blood sugar. Watermelon contains a certain amount of sugar and calories, and the glycemic index of watermelon is 72, which belongs to the high glycemic index food, so eating watermelon will cause blood glucose to rise. In daily life, diabetic patients with poor blood glucose control are not recommended to eat or eat less watermelon, while diabetic patients with stable blood glucose control can eat watermelon appropriately. Besides, both patients with high blood sugar and healthy people should maintain a healthy diet, avoid eating cakes, fatty meat, fried food and other high-sugar and high-oil food, and also do physical exercise appropriately. If abnormal blood glucose value occurs, it is recommended to go to the hospital as soon as possible, and standardize the treatment under the doctor’s guidance.