The thing is, no matter how your belly moans — no matter how hard you strain to stave off the looming food coma — that pie is actually the piece de no resistance. You simply can't say no. Science suggests it's no Christmas miracle. In fact, research published in the Journal of the Norwegian Medical Association points to a simple reason why, when it comes to your stomach, there's always room at the inn. Your belly doesn't bust. It bends.