I just remembered, I never run out of food as a warrior rather. Never got that far with the thief yet so, I really am not sure.
Haven't really gotten that far yet, I'm still not done with the first area though I got a peak of the second area which was the marsh I think or something? I presume that there are multiple areas still that I haven't reached yet. So far, I've played a bit of warrior, thief, then enchantress.
The ranger, thinking about it, I think it kinda makes sense that it always has a surplus of food? As it is generally a class adept to the wilderness or something like that. I imagine it just finding berries and hunting game here and there or so.