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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.
Carbohydrates, which contain natural sugars, cause gas, whereas proteins and fats typically do not. Beans, for example, are legendary for producing gas, because they contain the indigestible sugars stachyose, verbascose and raffinose. These sugars ferment contents in the digestive tract, producing gas and lots of it.