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The main flatus-producing culprit is the bacteria that lives in the stomach and colon and is responsible for the breakdown of digested foods. Undigested sugary compounds such as lactose, sorbitol and fructose, as well as carbohydrate-based foods like wheat or rice, are all known gas-making contributors. Swallowed air becomes trapped in the digestive system and can be expelled as flatulence, although the air cannot be the only cause due to its relatively small presence.

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