You are remembering correctly. As your hunger level increases the text that indicates hunger turns Red. At starveing it blinks Red and takes away one hp each step you take till either you die.. or eat something. However since that text warning is in the upper right hand of the screen, theres been a time or two I've missed seeing that I was that hungrey till it starts blinking
DF
PS. If this in in a game on OOII Headquarters.. bug report it please.