Respuesta :
No, only doing crunches will not help. You will have to do a variety of excercises to help lose weight around the belly. A good example of excercises that will help you lose weight would be cardio excercises.
The best way to lose weight is to cut back on eating. (As in don't decide on eating 2-3 deserts or plates) Do 15-25 sit-ups each day. Crunches also help, but very little. Even walking or jogging helps burn calories. But being on your period makes you eat more, and makes your metabolism slower. Hope this helps your friend:)