The Mindless Margin

Mindless Eating: Why We Eat More Than We Think
by Brian Wansink, Ph.D.

In this illuminating and groundbreaking new book, food psychologist Brian Wansink shows why you may not realize how much you're eating, what you're eating-or why you're even eating at all.

• Does food with a brand name really taste better?
• Do you hate brussels sprouts because your mother did?
• Does the size of your plate determine how hungry you feel?
• How much would you eat if your soup bowl secretly refilled itself?
• What does your favorite comfort food really say about you?
• Why do you overeat so much at healthy restaurants?

Brian Wansink is a Stanford Ph.D. and the director of the Cornell University Food and Brand Lab. He's spent a lifetime studying what we don't notice: the hidden cues that determine how much and why people eat. Using ingenious, fun, and sometimes downright fiendishly clever experiments like the "bottomless soup bowl," Wansink takes us on a fascinating tour of the secret dynamics behind our dietary habits. How does packaging influence how much we eat? Which movies make us eat faster? How does music or the color of the room influence how much we eat? How can we recognize the "hidden persuaders" used by restaurants and supermarkets to get us to mindlessly eat? What are the real reasons most diets are doomed to fail? And how can we use the "mindless margin" to lose-instead of gain-ten to twenty pounds in the coming year?

Mindless Eating will change the way you look at food, and it will give you the facts you need to easily make smarter, healthier, more mindful and enjoyable choices at the dinner table, in the supermarket, in restaurants, at the office-even at a vending machine-wherever you decide to satisfy your appetite.

Chapter 1

Did you ever eat the last piece of crusty, dried-out chocolate cake even though it tasted like chocolate-scented cardboard? Ever finish eating a bag of French fries even though they were cold, limp, and soggy? It hurts to answer questions like these.

Why do we overeat food that doesn't even taste good?

We overeat because there are signals and cues around us that tell us to eat. It's simply not in our nature to pause after every bite and contemplate whether we're full. As we eat, we unknowingly-mindlessly-look for signals or cues that we've had enough. For instance, if there's nothing remaining on the table, that's a cue that it's time to stop. If everyone else has left the table, turned off the lights, and we're sitting alone in the dark, that's another cue. For many of us, as long as there are still a few milk-soaked Fruit Loops left in the bottom of the cereal bowl, there is still work to be done. It doesn't matter if we're full, and it doesn't matter if we don't even really like Fruit Loops. We eat as if it is our mission to finish them.

Stale Popcorn and Frail Willpower

Take movie popcorn, for instance. There is no "right" amount of popcorn to eat during a movie. There are no rules of thumb or FDA guidelines. People eat however much they want depending on how hungry they are and how good it tastes. At least that's what they say.

My graduate students and I think different. We think that the cues around us-like the size of a popcorn bucket-can provide subtle but powerful suggestions about how much one should eat. These cues can short-circuit a person's hunger and taste signals, leading them to eat even if they're not hungry and even if the food doesn't taste very good.

If you were living in Chicago a few years back, you might have been our guest at a suburban theater matinee. If you lined up to see the 1:05 p.m. Saturday showing of Mel Gibson's new action movie, Payback, you would have had a surprise waiting for you: a free bucket of popcorn.

Every person who bought a ticket-even though many of them had just eaten lunch-was given a soft drink and either a medium-size bucket of popcorn or a large-size, bigger-than-your-head bucket. They were told that the popcorn and soft drinks were free and that we hoped they would be willing to answer a few concession stand-related questions after the movie.

There was only one catch. This wasn't fresh popcorn. Unknown to the moviegoers and even to my graduate students, this popcorn had been popped five days earlier and stored in sterile conditions until it was stale enough to squeak when it was eaten.

To make sure it was kept separate from the rest of the theater popcorn, it was transported to the theater in bright yellow garbage bags-the color yellow that screams "Biohazard." The popcorn was safe to eat, but it was stale enough one moviegoer said it was like eating Styrofoam packing peanuts. Two others, forgetting they had been given it for free, asked for their money back. During the movie, people would eat a couple bites, put the bucket down, pick it up again a few minutes later and have a couple more bites, put it back down, and continue. It might not have been good enough to eat all at once, but they couldn't leave it alone.

Both popcorn containers-medium and large-had been selected to be big enough that nobody could finish all the popcorn. And each person was given his or her own individual bucket so there would be no sharing.

As soon as the movie ended and the credits began to roll, we asked everyone to take their popcorn with them. We gave them a half-page survey (on bright biohazard-yellow paper) that asked whether they agreed to statements like "I ate too much popcorn," by circling a number from 1 (strongly disagree) to 9 (strongly agree). As they did this, we weighed their remaining popcorn.

When the people who had been given the large buckets handed their leftover popcorn to us, we said, "Some people tonight were given medium-size buckets of popcorn, and others, like yourself, were given these large-size buckets. We have found that the average person who is given a large-size container eats more than if they are given a medium-size container. Do you think you ate more because you had the large size?" Most disagreed. Many smugly said, "That wouldn't happen to me," "Things like that don't trick me," or "I'm pretty good at knowing when I'm full."

That may be what they believed, but it is not what happened.

Weighing the buckets told us that the big-bucket group people ate an average of 173 more calories of popcorn. That is roughly the equivalent of 21 more dips into the bucket. Clearly the quality of food is not what led them to eat. Once these moviegoers started in on their bucket, the taste of the popcorn didn't matter. Even though some of them had just had lunch, people who were given the big buckets ate an average of 53 percent more than those given medium-size buckets. Give them a lot, and they eat a lot.

And this was five-day-old, stale popcorn!

We've run other popcorn studies, and the results were always the same, however we tweaked the details. It didn't matter if our moviegoers were in Pennsylvania, Illinois, or Iowa, and it didn't matter what kind of movie was showing, all of our popcorn studies led to the same conclusion. People eat more when you give them a bigger container. Period. It doesn't matter whether the popcorn is fresh or fourteen days old, or whether they were hungry or full when they sat down for the movie.

Copyright © 2006 by Brian Wansink, Ph.D.

About the Author

Brian Wansink, Ph.D., is an Iowa native and earned his doctorate at Stanford University. He is the John S. Dyson Professor of Marketing and of Nutritional Science at Cornell University, where he is Director of the Cornell Food and Brand Lab. The author of three profesional books on food and consumer behavior, he lives with his family in Ithaca, New York, where he enjoys both French food and French fries each week.