"It literally takes a whole day away from your life, where you could be doing normal things and instead you are drinking this bowel prep that is uncomfortable and that limits your social life, " Kalloo said.

CNN: Coming clean about my first colonoscopy

Often these patients have surgery to transform bits of their bowel into bladder, but this is less than ideal since the bowel's job is to absorb fluid into the body, whereas the bladder's is to store it away before expulsion.

ECONOMIST: Stem cells

They might cause more bowel function, this is entirely true, but more is not quite the same as normal or healthy.

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