It's sad to watch people you love change from their illness. It's even more sad when you want to help them but you can't. Good thing you're around to keep an eye on him.
Maybe leaving some books around or printing some good articles that might help him change his beliefs. I know I have a few I wish everyone could read, although you can't believe everything, just something to ponder!
Oh, and my pancreas, yea, I used to not make it through a day without drinking 3 red bulls. Eventually I stopped after getting horrible intestinal cramps. They should really do studies on what those energy drinks do to you!