I agree with keeping busy, or if you can nap/sleep. I can tell when i need sleep as I want to eat everything I can see.
I've also used sunflower seeds in the shell to help with the munchies, not entirely sure how primal they are but they take forever to eat a large amount. Sometimes it's just the act of eating that can help get over that hunger hump rather than the amount you eat.
On many long journeys have I gone. And waited, too, for others to return from journeys of their own. Some return; some are broken; some come back so different only their names remain.