Avoid fizzy drinks. They cause gas and bloating.
Avoid wheat. Whole wheat and fiber can create some real problems.
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Avoid sugar. Sugary foods and drinks are empty calories that cause all kinds of health problems.
Well, the above tips should get you going in the right direction. However, if you are like I used to be, you may need a more permanent ongoing digestive problems and gas that will give lasting relief in the center response.