Research: "Gut bacteria affect intestines and brain in IBS patients"

http://www.medicalnewstoday.com/articles/316165.php

http://stm.sciencemag.org/content/9/379/eaaf6397

Transplanting fecal microbes from IBS patients into mice made the mice exhibit IBS symptoms. It is a mouse experiment, but it suggests that intestinal dysbiosis may be a primary cause of IBS. That is, something in an IBS sufferer's gut microbes is wrong, and causes the symptoms. And that implies that therapies such as probiotics, prebiotics, or fecal transplants could be effective.