http://www.scientificamerican.com/article.cfm?id=the-neuroscience-of-gut |
I found this part interesting:
"Regardless of how these intestinal “guests” exert their influence, these studies suggest that brain-directed behaviors, which influence the manner in which animals interact with the external world, may be deeply influenced by that animal’s relationship with the microbial organisms living in its gut. And the discovery that gut bacteria exert their influence on the brain within a discrete developmental stage may have important implications for developmental brain disorders."