There are some interesting ideas in this world (and a lot we still don’t know about ourselves), but this idea is so radical I’m almost afraid to write about it.
There is a short video on YouTube entitled “You Have a Second Brain” that claims your digestive system acts as another brain and it has far more control over us than we realize. It’s produced by AsapScience (running 4:46 with a brief commercial at the end). I found it through the EarthSky website (http://earthsky.org/human-world/do-you-have-a-2nd-brain-in-your-gut), but it can be accessed directly at https://www.youtube.com/watch?v=T3Ftj5E90tY.
It’s worth watching, and if proven true, could be something of a breakthrough.
(BTW, AsapScience has a series of these videos on YouTube. If you find this interesting, you might also try “Humans in 1000 Years”, https://www.youtube.com/watch?v=Cs1uud8HiCQ )