Obesity may be linked to microorganisms living in the gut, study says

The study, which will also appear in JCEM's April 2013 issue, analyzed the breath content of 792 people. Based on the breath tests, four patterns emerged. The subjects either had normal breath content, higher concentrations of methane, higher levels of hydrogen, or higher levels of both gases. Those who tested positive for high concentrations of both gases had significantly higher body mass indexes and higher percentages of body fat.
The presence of methane is associated with a microorganism called Methanobrevibacter smithii. This organism is responsible for the majority of methane production in the human host."

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