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Study: Surroundings play key role in diet

How many M&MS are enough? It depends on how big the candy scoop is. At least that's a key factor, says a study that offers new evidence that people take cues from their surroundings in deciding how much to eat.

It explains why, for example, people who used to be satisfied by a 12-ounce can of soda may now feel that a 20-ounce bottle is just right.

It's "unit bias," the tendency to think that a single unit of food — a bottle, a can, a plateful, or some more subtle measure — is the right amount to eat or drink, researchers propose.

"Whatever size a banana is, that's what you eat, a small banana or a big banana," says Andrew Geier of the University of Pennsylvania. And "whatever's served on your plate, it just seems locked in our heads: that's a meal."

The overall idea is hardly new to diet experts. They point to the supersizing of fast food and restaurant portions as one reason for the surge of obesity in recent decades. They sometimes suggest that dieters use smaller plates to reduce the amount of food that looks like a meal.

But in the June issue of the journal Psychological Science, Geier and colleagues dig into why people are so swayed by this unit idea when they decide how much to eat.

Geier, a Ph.D. candidate who works with people who are overweight or who have eating disorders, figures people learn how big an appropriate food unit is from their cultures. For example, yogurt containers in French supermarkets are a bit more than half the size of their American counterparts. Yet French shoppers don't make up the difference by eating more containers of the stuff, he noted.

He and the other researchers tried a series of experiments using environmental cues to manipulate people's ideas of how big a food unit is.

In one, they put a large bowl with a pound of M&Ms in the lobby of an upscale apartment building with a sign: "Eat Your Fill ... please use the spoon to serve yourself." The candy was left out through the day for 10 days, sometimes with a spoon that held a quarter-cup, and other times with a tablespoon.

Sure enough, people consistently took more M&Ms on days when the bigger scoop was provided, about two-thirds more on average than when the spoon was present.

In another experiment, a snacking area in an apartment building contained a bowl with either 80 small Tootsie Rolls or 20 big ones, four times as large. Over 10 working days, the bowl was filled with the same overall weight of candy each day. But people consistently removed more, by weight, when it was offered in the larger packages.

In those experiments, as well as a similar one with pretzels, "unit bias" wasn't the only thing that produced the differences in consumption levels, but it had an influence, Geier and colleagues concluded.

Brian Wansink, director of Cornell University's Food and Brand Lab and author of the forthcoming book "Mindless Eating: Why We Eat More Than We Think," called the new paper an impressive demonstration of the effect in a real-world setting. He has done similar work but didn't participate in Geier's research.

So can all this help dieters?

Some food companies are introducing products in 100-calorie packages, and Geier thinks that could help hold down a person's consumption. He also suspects companies could help by displaying the number of servings per container more prominently on their packaging.

As for what dieters can do on their own, Geier said one of his overweight patients offered a suggestion for restaurant visits: Request that the meal be split in two in the kitchen, with half on the plate and the other half packaged to take home.

In any case, an earlier experiment of Geier's shows that the unit bias effect has its limits.

He had one dining hall at his university provide 10-ounce glasses for soda, and a second provide 16-ounce glasses. He predicted that students at the first hall would drink less soda. In fact, they drank more.

Only later did he find out what went wrong.

"They were taking two glasses at a time," he said. "I guess I went below what is culturally construed as a unit of soda."