Basically, this is what it needs:
Food (Items, not bricks)
Hunger that counts down
Optional interface - Maybe something like notifications, where it shows in your chat 'I'm getting hungry' or 'My stomach feels empty' getting more severe the more hungry you get.
I saw this on a server once upon a time and I think it was private. I just want some iffy models (Maybe a cylinder that's green for a can, a few spheres for some berries or something, brown rectangle for a chocolate bar, you get what I mean) and maybe some kind of items like Can Openers, etc.
I just want something functional and not fancy.