5 Foods To Combat Bloat And Flatten Your Stomach If your belly bloat is putting a damper on things, These 5 foods can help you to fight back. 1. Bananas The potassium in bananas helps to manage your sodium levels, preventing constipation and bloating. 2. Celery Celery combats fluid retention, diminishes gas and helps keep you regular with fiber. 3. Pineapple This fruit has high amounts of the enzyme bromelain, which breaks down protein and eases digestion. 4. Watermelon This waterlogged fruit helps with water retention and your sodium levels. 5. Oatmeal Oat bran promotes digestion, keeping your belly flat all day long.