IIRC, the appetite is not diminished, however he would have to be careful not to over-eat as he could kill himself.
A large number of concentration camp victims died as a result of overeating after liberation.
( The Teviot Moose major 5th., Thu 13 Nov 2008, 10:32, archived)

I've heard that
Never seen anything to back it up, so I'm not sure if it's an urban myth.
( Lord Gnome, Thu 13 Nov 2008, 10:35, archived)