Researchers found that participants with increased methane and hydrogen levels in breath samples had higher BMI and body fat than did those with normal samples and those whose samples showed a higher concentration of only one of the two gases. The findings in the Journal of Clinical Endocrinology & Metabolism suggest an overabundance of the bacteria Methanobrevibacter smithii in the gut, which may increase the risk of weight gain and fat accumulation, researchers said.

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