If you're heading to see a movie this weekend, you might want to reconsider your popcorn portion. (Sorry, I love it, too, but this makes me think twice).

Researchers at Cornell University, when they studied portion size, found that even if the popcorn was stale, moviegoers ate 34 percent more from big buckets than those who were served the same popcorn from medium-sized containers. And if the popcorn was fresh, the rate climbed to 45 percent more.

What does this all mean? Regardless of taste, portion size influences intake. Fresh or stale, tasty or not, some people, when served a large portion, might consume more than they really might need or want. And they may not even be aware of it, because subjects reported they'd eat the same amount if they'd been given a medium container.

Just order a small bag. Chances are you'll be just as satisfied. And oh, say these three words: "hold the butter." (Please.)