1. Food Similarity (1) Watermelon and avocado: They are easy to induce vomiting when eaten together. (2) Watermelon and kiwifruit. 2. Take medicine, eat watermelon and take glucocorticoids. Glucocorticoid can promote protein decomposition, strengthen gluconeogenesis of glycogen, and inhibit the utilization of glucose by peripheral tissues, thus increasing blood sugar. Watermelon is rich in sugar, and eating it together may induce diabetes. 3. People who have the same disease and eat the same food (1) should not eat more: watermelon contains more water and tastes sweet, which will increase the burden of heart and kidney and aggravate the patient's condition. (2) People with chronic gastritis, enteritis and digestive dysfunction should not eat more: such patients should eat food that warms the yang and strengthens the spleen, and avoid eating cold food. This product is cold, which hurts yang and helps cold, and contains more water. Eating too much will dilute gastric juice and reduce digestive function. (3) Enuresis patients should not eat: Enuresis patients should be hard and astringent, and avoid sweet and light food. The taste is sweet and light, which will aggravate the patient's condition after eating.