Eating too much watermelon can lead to weight gain. Watermelon contains a large amount of fructose, so it has high calories. Moreover, it's difficult to control the portion when eating watermelon, so people often end up consuming a lot of it without realizing. The calories in one pound of watermelon are equivalent to those in a bowl of rice. Especially if you eat too much watermelon before going to bed, it will cause insulin levels to rise, promoting fat synthesis. Coupled with the reduced physical activity at night, fat tends to accumulate in the abdomen. Therefore, you shouldn't eat too much watermelon. Generally, the maximum amount you should eat per day is about 1.1 pounds (500 grams). Watermelon is a cooling fruit, so people with weak constitutions and cold stomachs, as well as women during their menstrual periods, should not eat too much of it.