Watermelon is more than 94% water, but its sugar content is also high. Watermelon with normal sweetness contains 5% sugar, so watermelon has a high calorie. The calorie of watermelon is 250 kcal/kg. That is to say, if you eat a big watermelon every day, it is about 8 to 10 kg, that is, you consume 1000 to 1250 kcal, while the calorie of a small bowl of rice in an ordinary family is about 200 kcal. In other words, eating a watermelon is equivalent to eating five or six bowls of rice, and eating watermelon at night will make you fat.