The gas in our intestine comes from several sources : air we swallow, gap seeping into intestines from blood, gas produced by chemical reaction in our guts and gas produced by bacteria that living in our guts. The composition of fart gas is highly variable. Most of the gas especially oxygen, is trapped by body before it gets into intestine. By the time gas reaches the intestines , most of the nitrogen is left in large intestine. Moreover, the chemical reaction between stomach acid and intestinal fluids may produce hydrogen gas, which is also being a product of bacteria action. Bacteria is also produce hydrogen and methane.
The longer a fart is held in, larger the proportion of inert nitrogen because the other gases tend to be absorbed into bloodstream through the wall of intestine. A nervous person who swallow a lot of air and who moves stuff through his digestive system rapidly may have a lots of oxygen in his/her farts because his body didn't have time to absorbs the oxygen.
If both parents are methane producers , their children have a 95 percent chance of being producers as well. Some researchers suspect a genetic influence, whereas others think the ability is due to environmental factors. However, all methane gas comes from bacteria and not form body cells.
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