I spent time at a complementary cancer centre (encouraging diet change, meditation etc) and they emphasized not putting all one's faith in the medical model alone. Don't get me wrong, I do whatever my trusted doctor tells me, but I also know to look beyond and not rely on him alone.
Glad you found the book helpful. I think those life changes can only ever be good for a person...
Good luck that you never ever need to use the info for anything other than reading material