Even though the microflora producing them has still not be completely identified, relatively large quantities of gases are released by fermentation in the human colon (from 0.5 up to 4 l/d). The composition of the gas flatus varies considerably from one individual to the other.11 33 34 Healthy subjects pass flatus gas up to 14 times a day with a total volume of between 0.35 and 1.4 l,1133 and they absorb and excrete, in-breath, a variable proportion of all gas (mainly H2 and CO2 but also CH4 in some individuals) produced in the colon. The excretion of semi-in-breath is used as a quantitative measurement of carbohydrate fermentation35 36 (see Section 126.96.36.199).
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