Not surprising, our gut flora love the stuff. My old microbio lecturer used to always get his class to run an experiment where people would test the growth of different types of good bacteria found in the gut using different food sources. Some would be random foods, others would be bio active drink made for the task and, ever present, was porridge (about the same thing). Porridge always won.

It also has one of, if not the lowest glycemic index of all carbs.