You're not fat, are you? As for food, don't eat too hard at noon. You can eat less in the evening, or eat some low-calorie food, and then you can do some sports in the afternoon, such as swimming, dancing and aerobics. You can do slimming yoga at night. Now that you are developing, you should keep up with your nutrition. Stand for half an hour after eating. Usually you can't sit or just stand for a long time. Children should not drink too much water before going to bed at night, but drink more water during the day. Besides, I have a friend who uses celery juice to lose weight. You can try, but celery juice tastes terrible.