A friend gave me the book, "The UltraMind Solution", which I found to be very interesting. He discusses how what is going on in the body is what affects the mind, and not the other way around. He discusses dementia, altzheimers (sp?), autism, etc. He really dwells on toxins as many of these newer,more informed, functional medicine docs do. He has other books out there, but I haven't gotten to them yet.
Yes, I took processed foods out of my diet years ago, having nothing to do with IBS. I just wanted to feel the best I could.