im five years post op...+ can honestly say I have not been "hungry" once (nor have I heard my stomach growl/felt a rumble).
i call the feeling which I now think of as me hungry, "empty". which I guess is that "hollow" feeling y'all are mentioning. to this day, 5 years out, I can be caught saying (out loud) "I think I am empty". kind of feel like a gas tank.