hey, thanks ;)
yes, there's kinda a hunger system; if you don't rest (either at a tavern or via camp), the party gets "exhausted" which pretty much halves party's efficiency. Then you need to rest, which is where the party eats as well.
Nobody's dies if you don't rest, but there's no other way to restore spell points (although you can heal through other means and reverse exhaustion, but that will a few spell slots which you may not have)