https://www.sciencedaily.com/releases/2017/05/170518140232.htm

As time goes on, my relatively prescient prediction that ‘we are our bacteria, and they are us (particularly those we acquire in childhood)’… continues to gain scientific validation… I believe that in time we shall discover that many of the things we believe to be ‘happening in the brain’ are actually being generated and shaped… by our bacteria… not our brains.

“Bacteria in the gut can influence the structure of the brain’s blood vessels, and may be responsible for producing malformations that can lead to stroke or epilepsy, new research suggests. The study adds to an emerging picture that connects intestinal microbes and disorders of the nervous system.”