What foods should i stay away from to get a flatter stomach?

Simple carbs: Foods with simple carbohydrates like sugars (cake, donuts, ice cream).

Weight loss in: general. For flatter abdomen eat healthy & get physically active. Calories burned > calories consumed. To tighten ab's: crunches, reverse crunches, exercise ball crunches, pelvic thrusts, lying leg raises, side bridge & “bicycling” exercise on back. Engage in regular aerobic exercise (i.e. running, swimming, Nordic track, bicycling, kickboxing, walking, cross country skiing, hiking, etc.)