"Say you eat an entire Thanksgiving dinner, then come into contact with marijuana, and come back 45 minutes later ready to eat again -- this is not normal, from a systemic standpoint," he said. "But the reason is quite simple, really." Simple for a professor of comparative medicine and neurobiology at Yale University School of Medicine, maybe.
You're hardwired to get the munchies
Think of it like this: the cannabinoids are re-wiring the circuits in your body that tell you you are full. It's like if a mechanic went under the hood of your car and switched your brake and accelerator.
How exactly, it makes your hunger-pangs all topsy-turvy, is still a mystery for the most part. The research has led Horvath and his co-authors to the conclusion that munchies are strictly a physiological reaction, without any psychological influence, which was initially suspected in some munchies research.