Regarding his physical appearance: What worries me more than the weight is the slowness with which he moves. Might indeed have something to do with his back problems. Definitely not ideal for touring ... nor for anything else.
The interview wasn't as banal as I'd expected it, the interviewer went a bit beyond the usual. What I found interesting, among other things, is what he said about the kind of character that Good on You Son is about. When I heard that song for the first time (okay, not the first, maybe the sixth, because before that I was too concerned with Guy's production), I automatically assumed that there must be some underlying irony in the lyrics. As in Early Bird, My Parties, Millionaire Blues or even The Fizzy and the Still. But it seems that there isn't in this case. He said in the interview that his honest attitude towards people who've "made it" really is: "Good on you, son. I'm glad for you." Does this make the song less interesting? Maybe. Or maybe the opposite.