There are a lot of myths about beating stomach bloat and getting a flat tummy, but the FODMAP approach has been scientifically proven to work for both. FODMAPs are sugars found in certain foods that can be hard to digest, and can cause discomfort, gas, and IBS (irritable bowel syndrome) symptoms. Some of the most nutritious foods around are high in these sugars, frustrating people who eat well but still have tummy issues. Apples, garlic, onions, beans, dairy, bread, and cereals are on that list. It may sound complicated or far-fetched but the many converts who have tried the science-supported diet swear by it.