" Overproduction of gas is not a pleasant thing—it bloats the gut, making us feel uncomfortable—but passing a bit of wind is not only necessary, it is healthy, too. We are living creatures with a miniature world living inside us, working away and producing many things. Just as we release exhaust fumes into the Earth’s atmosphere, so must our microbes, too. It may make a funny sound and it may smell a bit, but not necessarily. Bifidobacteria and Lactobacilli, for instance, do not produce any unpleasant odors. People who never need to break wind are starving their gut bacteria and are not good hosts for their microbe guests. Pure prebiotics can be bought at "

― Giulia Enders , Gut: The Inside Story of Our Body’s Most Underrated Organ