As a Gastroenterologist, Dr. John Cluley focuses on the esophagus, stomach, small intestine, colon, anus, and rectum. Or, as GI John himself calls it, the butts and guts. In addition to being a board-certified medical doctor and self-professed poop joke scholar, Cluley also manages an Instagram account where he posts assthetically pleasing photos of gut pleasing foods: FitGutMD.