Where you're eating: Even if your food doesn't taste so good, you might continue eating depending on your environment. A Personality and Social Psychology Bulletin study showed that people ate the same amount of popcorn in a movie theatre, whether it was old and stale or fresh and just-popped.
"The results show just how powerful our environment can be in triggering unhealthy behaviour," said study researcher David Neal, a psychology professor at the University of Southern California.
