Eating red grapes at night is generally not cause obesity, of course, red grapes sugar content is high, if there is no control of eating, or may be fat. Mainly because, sugar can be converted into fat. Want to increase weight, to appropriate exercise, promote gastrointestinal peristalsis; increase the amount of food, promote digestion and absorption. Fattening is recommended to eat more easily digestible, high-quality protein, high-energy food, such as milk, chicken, duck and so on. Any food should not be eaten in excess, and should not be overeaten. On a regular diet, pay attention to balanced nutrition and avoid partiality. Overwork or mental anxiety will also affect the appetite, which is not conducive to gaining weight. Therefore, we should maintain a good state of mind and avoid overwork. In the process of gaining weight, also pay attention to the gastrointestinal tract digestion and absorption function. If there are digestive diseases, such as gastritis, duodenal ulcer, gastrointestinal tumors, etc., should be actively treated.