Methanobrevibacter_A smithii | Archaea

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Methanobrevibacter smithii, despite it's genus name, is not a bacterium. Instead it is a very common archaeon with the ability to produce methane from two major end-products of fermentation in your gut: hydrogen and carbon dioxide. By doing so, they increase the efficiency of bacterial digestion. Methane has also been shown to decrease gut muscle activity which can lead to constipation. M. smithii has been found to be abundant in lean people and may be protective against weight gain.