Have you ever polished off an entire tub of movie theater popcorn by yourself, not realizing how much you were eating until your hand grazed the cardboard bottom? If you’re anything like me, probably. What about eating a whole package of snack-size bags in one sitting? Probably not. That’s because reaching the end of a container—however big or small—creates a decision point: a moment that interrupts our automatic behavior and gives us an opportunity to make a conscious choice. In this case: “Do I want to keep eating popcorn?”
