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| | Flatulence (Gas) |
 | | Excess gas in the digestive tract (which is your esophagus, stomach, small intestine, and colon/large intestine) can come from 2 sources: increased intake of gas, for example, from air you swallow; or increased production of gas as certain undigested foods are broken down by harmless bacteria normally found in your colon. |
 | | Analysis of the gas can help determine if it originated from aerophagia (mostly nitrogen, also oxygen and carbon dioxide) or GI production (mainly carbon monoxide, hydrogen, and methane). |
 | | Breakdown of undigested foods: Your body does not digest and absorb some carbohydrates (for example, the sugar, starches, and fiber found in many foods) in the small intestine because of a shortage or absence of certain enzymes there. |
| www.emedicinehealth.com /flatulence_gas/page2_em.htm (812 words) |
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