You're not pooping right
Pooping while seated on a toilet is bad for us, according to Giulia Ender's book Gut: The Inside Story of Our Body's Most Underrated Organ. Enders, pursuing a medical doctorate in microbiology in Grankfurt, says pooping is done much more efficiently from a squatting position.
A bend in the lower intestine called the anorectoal angle is kinked like a garden hose when we are in a seated position. Because that part of the intestine is unable to fully open we end up straining in order to push the poop out. But in a squatting posture, the bend straightens out, eliminating the kink and allowing us to defecate much more efficiently. Squatty Potty, a product that allows you to squat while using a standard sitting toilet, could be a solution.
Enders also writes about gut bacteria and the links between the health of our bowels and our mental states. Her interest in the subject began when she met a man at a party with the worst breath she had every smelled. The next day, the man killed himself, inspiring Enders to research whether a diseased gut (which could cause horrible breath) could also affect an individual's psychological state. Gut: The Inside Story of Our Body's Most Underrated Organ is also full of fun facts not necessarily related to poop, like - our spit contains a more powerful painkiller than morphine: opiorphin. (We produce more opiorphin when we eat, which could be a factor in comfort eating.)