Yeah there are a lot of edge cases like regen stacking, Gozag, Troll/Ogre spellcasting etc that would be a lot stronger without food.
I need to test it before commenting, but it feels there would need to be a ton of changes to accommodate this.
I've played a LOT of trolls, hunger or food never affected my choices, outside of course of not using gozag. You just end up with so much permafood anyway, and trolls tend to go through content pretty quick.
Regen stacking? Like what, an amulet and the spell? It's hardly gamebreaking, and again, you could always do this, the hunger costs weren't that extreme.
The idea of xomscumming... well yeah, food did prevent that for non mummies. Perhaps that's something that will need to be addressed at some point, because if lingering on d1 for 10000 turns makes you 1% more likely to survive, some people will do it.
For gozag, I just think it moved him from too annoying to use to a god some people might actually pick.
Early game spriggan is noticably impacted by this, making it even easier, since their need to eat permafood only meant you had to be careful with your spellcasting. Now you can just kite and try again as necessary. Outside of the early game this becomes less and less of an issue, although the psychological pressure certainly remains in the back of your head.
The centaur change to rollyball normal speed is weird... but then, centaurs were incredibly boring to me before. Fast enough to run away, terrible aptitudes mean you'll have to run away a lot. I don't get the need to remove the old races but that battle was lost a long time ago...