It doesn't, as far as I know. The only claim I made - and which mwengler contested elsewhere in the thread - was about the 'alternative' diet stuff. A quick googling doesn't turn up much in the way of evidence for the liver thing.

Edit: Ah, I see you've already commented on that. Nevermind.

(I think most people probably downvoted for saying "Seriously, if there is someplace the story is told that Jobs shortened his life by not doing the rational thing please link it and/or summarize it" when my grandparent comment had the link. Admittedly I added the summary afterwards.)