The free popcorn test
A 2001 Cornell study reported the size of a popcorn bucket can short-circuit a person's hunger. For this experiment, there were two groups: one was given a medium-sized bucket of popcorn, the other a large bucket. Those with a big bucket ate roughly 173 calories and an average of 53 percent more popcorn than those given the medium-sized buckets. The lesson: use a small bowl of food to resist the urge to mindlessly eat.