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the gas that makes up a fart comes from two sources: more originates from the breakdown of food by the digestive system, and some is from swallowed air. In the first case, foodstuffs are broken down by enzymes, stomach acids, and intestinal bacteria in order for the energy in them to be made available to the body. Through the processes of digestion and fermentation, gases can be liberated from what's eaten. In the second case, air that a person swallows from eating, drinking, breathing, chewing gum, and being stressed, among other ways of entry, that's not expelled during a burp travels through the stomach and intestine, transforming into fart-ready mode. In either case, the gases flow down through the rest of the digestive tract and eventually exit the body hahaha8212; Poof! Ping! Pfft! Toot-toot! Kaboom! hahaha8212; expelled as a fart, or farts. And this silent or noisy expulsion of air can help bring about some relief and comfort from a buildup of gas within the lower part of the body.
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