2. Watermelon is low in calories and fat, rich in vitamins and minerals, and rich in water. Has the effects of clearing away heat, relieving summer heat, quenching thirst and promoting diuresis. However, watermelon contains a lot of sugar, which will be converted into fat in the body when eaten in excess, thus causing obesity. In addition, watermelon is a cold fruit, which is not suitable for people with spleen and stomach deficiency and cold, and may cause abdominal pain and diarrhea. If you want to lose weight, you still need to cooperate with effective exercise and fitness exercise. Eating watermelon too late is bad for the stomach, and eating watermelon at night can't lose weight.