You have 37.2 trillion cells in your body and if you think that sounds like a lot, your body also is home to more than 10 times that amount of one-celled microbes (bacteria and yeast). A large percentage of those live in your digestive tract [source: Strippoli, LiveScience]. Clostridium, E. coli, Klebsiella; these microorganisms, for example, among others, are part of the intestinal flora living in your colon. And there they hang out, dining on the undigested food that ends up in the lower intestines. The gases that make up flatulence are the byproduct -- the waste product -- these microbes produce as they break down those carbohydrates in your colon. Go ahead and blame your farts on them.