Don't eat less or just some fruit for dinner. If you are willing to exercise sometimes, find a time to jog for 30-40 minutes or jump rope 500- 1000 times in the evening. Massage the stomach clockwise before going to bed 100 times. If it can be implemented immediately after menstruation, it will have obvious effects in one week and you can lose about 3 pounds. Everyone's constitution is different. You can try.