Dragon fruit and watermelon can be eaten together to supplement the body’s water, carbohydrates, dietary fiber and other nutrients, but it is not recommended to eat a large number of the same food, which may cause gastrointestinal discomfort. Each 100 grams of dragon fruit contains about 84.8 grams of water, 13.3 grams of carbohydrates, 2.0 grams of total dietary fiber, phosphorus 35 mg. Every 100 grams of watermelon contains about 93.3 grams of water, carbohydrates 5.8 grams, potassium 87 mg. These two fruits are not obvious consumption conflict, together with the human body can also supplement the water, dietary fiber, minerals and so on. However, because these two foods are cold fruits and melons, if too much at one time with food, may trigger abdominal pain, diarrhea, intestinal chirping and other gastrointestinal discomforts. Daily dietary recommendations for scientific collocation, reasonable intake of a variety of nutrients, to avoid eating more spicy stimulation, cold, greasy food, good health.