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Some experts even recommend avoiding certain vegetables including onions, radishes, cabbage, celery, carrots, Brussels sprouts, broccoli, cauliflower. But if you avoided some of these foods, especially the nutritious vegetables, you'd be missing out on valuable vitamins and nutrients just because you're afraid of gas.
Common causes of gas include: 1  Swallowed air. 2  Gas-producing foods and drinks, such as beans, broccoli, carbonated drinks, and beer. 3  Constipation. The side effects of medicines or supplements, such as narcotic pain medications, vitamins, iron supplements, and many medications that are used to treat constipation.  Changing hormone 1  levels. Pregnancy.