Occasional small amounts eaten at night generally will not gain weight, if it is a long-term, large amount of food, and the lack of daily exercise, the possibility of gaining weight is higher. Watermelon is also called watermelon, summer melon, cool melon, rich in vitamin C, protein and trace elements, etc., but the sugar content and calories of watermelon are very high, weight loss people should try to eat less. 1, sugar content: watermelon contains high sugar content. Eating watermelon at night will lead to an increase in the body’s sugar content, which in turn leads to an increase in insulin levels in the body, resulting in the formation of a large amount of fat accumulation, if not enough exercise leads to fat can not be consumed will become fat; 2, heat: watermelon not only high sugar content, calories are also relatively high. Each 1 kg of watermelon may contain 260 kcal, and a bowl of rice calories about 116 kcal, so eat more watermelon in the case of insufficient exercise may lead to obesity. Watermelon is cold and contains more water, and people with poor stomach and intestines are prone to diarrhea when eating at night. It is recommended that during the weight loss period, try not to eat before bedtime, moreover, avoid eating watermelon and other foods with high calories and sugar, and after eating should be combined with jogging, playing ball and other sports to increase consumption.