Typically, watermelon has a higher glycemic index than apples. Watermelon has a higher glycemic index of 72, which is a high GI food, while apples have a lower glycemic index of 36, which is a low GI food. Diabetic patients can consume watermelon and apple in moderation to replenish the nutrients needed by the body. In daily life, both patients with high blood sugar and healthy people should maintain a healthy diet, avoiding high-fat, high-sugar and high-salt foods, all of which can help to maintain the stability of blood sugar. Patients diagnosed with hyperglycemia should also actively cooperate with their doctors for treatment and seek prompt medical attention if they find abnormal blood sugar levels.