For example, ... noodles, and wheat, produce gas as they are broken down in the large intestine. In general it is not methane that we burp. Not all humans produce flatus that contains methane. Intestinal gas can be reduced by fermenting the beans, and making them less gas-inducing, or by cooking them in the liquor from a previous batch. (See Why Beans Make You Fart) Cows fart and burp… a lot. Most of it is actually burped out but they do produce a lot of fart gas. Usually that’s either just swallowed air, or maybe CO2 fizz from soda pop we drank. The main flammable gas in (human) flatulence is mostly hydrogen, although the ratio depends on the individual. *our experience of our children’s vegetarian school friends who came to tea was that they didn’t eat vegetables either. They have a complex digestive system in which microbes break down the food they eat, this produces a lot of methane gas. Because humans … This is a concern because methane is a much more potent greenhouse gas than CO2. Human methane production is not significant. We do not have a herbivore’s digestion tract. ANSWER: Hydrogen, carbon dioxide and methane are all produced in the gut and contribute 74% of the volume of flatus in normal subjects. Human farts do not contain much methane, and some people don’t have any methane in their farts at all. For example, the fermented bean product miso is less likely to produce as much intestinal gas. Much like humans, when they eat, gas builds up inside of their guts and has to be expelled. Most of it is released as burps, but some certainly escapes out of the rear end, too! Hydrogen, carbon dioxide, and methane make up as much as 99 percent of the gas produced in our large intestines by volume. Not all humans produce flatus that contains methane. 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