if my antibiotics don't work, the xifaxin, they are considering this.  There is some evidence that it can be LINKED with obesity but it's a chicken and the egg thing. And often the treatment is an extreme starvation diet for a few weeks if it's the methane type and the can't kill the archaea, a non bacteria organism that lives in your gut. Mine is more likely from having C.diff a few years ago. It's called small intestinal bacteria overgrowth or SIBO