Not sure which version you're playing, but currently when you're low on food you get your avatar grunting every 3 seconds as though someone's clubbing him over the head and the view skews off to one side as though someone's clubbing him over the head. :C
This may be down to the regeneration - you lose some health due to hunger, then goes back up again, not sure if it still does that at half health. :?
EDITED: 19 Dec 2011 09:52 by GRAPHITONE