Trimming supersize meals with half-orders and plate colors

WASHINGTON -- Call it the alter-ego of supersizing.

Researchers infiltrated a fast-food Chinese restaurant and found up to a third of diners jumped at the offer of a half-size of the usual heaping pile of rice or noodles -- even when the smaller amount cost the same.

Giant portion sizes are one of the culprits behind the epidemic of bulging waistlines, and nowhere is the portion-creep more evident than in restaurants with French fry-heavy meal deals or plates overflowing with pasta. Now scientists are tapping into the psychology of eating to find ways to trim portions without people feeling cheated -- focusing on everything from the starchy sides to the color of the plates.

"The small Coke now is what used to be a large 15 years ago," psychologist Janet Schwartz said, a marketing professor at Tulane University who led the Chinese food study. "We should ask people what portion size they want," instead of large being the default.

Restaurants are paying close attention, said prominent food-science researcher Brian Wansink of Cornell University. His own tests found children were satisfied with about half the fries in their Happy Meal long before McDonald's cut back the size, and the calories, last year.

"We'll be seeing some very creative ways of downsizing in the next couple of years," predicts Wansink, author of "Mindless Eating: Why We Eat More Than We Think."

But let's call it "right-sizing," said Duke University behavioral economist Dan Ariely. Right-size suggests it's a good portion, not a cut, he said.

Couldn't you just get a doggie bag? Sure, if you've got the willpower to stop before your plate is mostly clean. Lots of research shows Americans don't. We tend to rely on visual cues about how much food is left, shoveling it in before the stomach-to-brain signal of "hey wait, I'm getting full" can arrive.

So Schwartz and Ariely tested a different approach: Could we limit our own temptation if we focus not on the tastiest reason we visited a restaurant -- the entree -- but on the side dishes? After all, restaurants can pile on calorie-dense starches like rice or pasta or fries because they're inexpensive, filling the plate so it looks like a good deal, Schwartz said.

There are tricks that can trim portions without people noticing, whether dining out or at home. Wansink found people served 18 percent more pasta with marinara sauce onto a red plate than a white one -- and 18 percent more pasta alfredo onto a white plate.

A stark contrast "makes you think twice before you throw on another scoop," explains Wansink. His own family bought some dark dinner plates to supplement their white ones, because people tend to overeat white starches more than veggies.

Wansink's other research has found:

* Switching from 11-inch plates to 10-inch plates makes people take less food, and waste less food. The slightly smaller plate makes a normal serving look more satisfying.

* People think they're drinking more from a tall skinny glass than a short wide one even if both hold the same volume, a finding Wansink said was widely adopted by bars.

* Beware if children eat from the adult bowls. He found 6-year-olds serve themselves 44 percent more food in an 18-ounce bowl than a 12-ounce bowl.

Restaurants are starting to get the message that at least some customers want to eat more sensibly. Applebees, for example, has introduced a line of meals under 550 calories, including such things as steak.

And a National Restaurant Association survey found smaller-portion entrees, "mini-meals" for adults and children, and bite-size desserts made a new trend list.

It's all consumer demand, said association nutrition director Joy Dubost: More diners now are "requesting the healthier options and paying attention to their calories."