We don't all respond to the same diets in the same way, and results from a new study help explain why: Gut microbes that naturally produce more methane are also able to squeeze more energy and calories out of high-fiber foods. Everyone is different when it comes to the mix of bacteria and other microorganisms that reside in their gut, called the gut microbiome . We already know that methane-producing microbes called methanogens can vary in abundance, which means methane (CH 4 ) production also