The “everything in moderation” mantra sounds like great advice for weight management. Enjoy all your favorite junk food, but stick to reasonable portions and don’t indulge too often. For most of us, that’s easier said than done.

Now, a new discovery by a team of scientists at the University of North Carolina (UNC) School of Medicine may help explain why so many of us can’t resist polishing off a jumbo bag of chips or a carton of ice cream in one sitting – even if we know it’s not a good i