Hi, 

Getting a flat belly has everything to do with what you eat. Eating the suitable amount of calories for you is the key to loosing weight and achieving a flat belly. You can get some professional help regarding the caloric intake you need per day and the foods you should try to eat more of. Add exercise to the plan and you're on your way to loosing a few extra pounds.

DON'T EXAGGERATE!!! It's really important to keep a healthy diet. Don't starve yourself or anything of the sort. A dietitian can be very helpful in planing a diet suitable for you.

Good luck.