Gut flora linked to late onset autism and personality. Fascinating: www.theepochtimes.com/n2/science/gut-bacteria-may-influence-our-personalities-study-56415.html I've got a pretty strong shift in personality together with joint pain, vision problems and hair falling off when I relapsed because of a anti viral treatment. I really think gut changes are the only likely explenation. I also got OCD like symptoms coming from "nowhere". And just to clarify; I've never had, or even have had tendencies to have, psychiatric problems. But I got a OCD like symptoms out of nowhere as part of a symptoms package when I relapsed. Which bacteria dominate the gut will turn on and off genes. I am pretty much a blue print of my dad, but when I relapsed I got a personality shift which matched my mothers side very much. It's the strangestt thing, I know.