Red = Don't Eat: Simple Food Labels and the Effective Illusion of Control

If soda bans take an implicitly cynical view of human nature, food labels that give consumers the impression of freedom might be their opposite.

thorndike-bev-refrig-2_615.jpgMassachusetts General Hospital

From New York City's point of view, humans are notoriously bad at making good decisions. That's what makes a ban on large sodas necessary: the idea that Americans can't be trusted with their own health. But maybe there's a middle ground between letting people gorge themselves on junk food and making it illegal. The key to making it all work is creating an environment where consumers still believe they're in control. 

trafficlightPA10030_200.jpgThe British government has also tried adopting a similar red-yellow-green food labeling model. (UK Food Standards Agency)

Data released this week by the Massachusetts General Hospital describes the efficacy of a stoplight-style color-coding system that researchers applied to foods and beverages sold to hospital cafeteria-goers. Products were labeled as red, yellow, or green according to three main indicators:

  • How many of the item's main ingredients contained either fruit, vegetables, whole grains, or low-fat dairy?
  • Did the item have a lot of saturated fat?
  • Did the item have a high caloric content?

Items that had healthier ingredients and less of the bad stuff were given a green label that advised diners to "consume often." Items that had good and bad in equal proportions were given a yellow label; customers were told to consume these products "less often." Items with a great deal of calories and saturated fat were given a red label. "There is a better choice in green or yellow," diners were told. After launching the labeling system, the researchers then took the added step of moving things around so that the green-labeled items were more accessible.

After six months, the researchers found that the labeling initiative had succeeded in curbing red-item purchases, and it had even increased purchases of green products. Red-item purchases fell by 11 points. Green-item purchases rose by 6.6 points.

Beverages in particular saw some of the biggest changes. "Overall, employees' red beverage purchases decreased 23.8 percent during the Phase-1 labeling intervention," the study's authors wrote, "and they further decreased by 14.2 percent during the Phase-2 choice architecture intervention." Mayor Bloomberg, call your office.

Broken down by race, Latinos, blacks, and whites all saw big gains in terms of green-item consumption -- 9.4, 6.7, and 6.6 percentage points, respectively -- and the biggest decreases in red-item consumption -- by 11.4, 10.1, and 11.2 points, respectively. It's hard to say whether the decreases were the result of the labels themselves, peer pressure (nobody wants to be the only one buying heaps of red items if all their lunchtime friends are buying green, am I right?) or some combination of factors. But the improvements happened. 

The experience of the study at Mass General suggests that people will choose healthier behaviors with even a mild level of intervention. That's great news. It turns out it's actually possible to transform our susceptibility to suggestion into an asset that works for us. By hijacking the same weaknesses that in other circumstances cause us to do what advertising, plate size, and other subtle external cues tell us to do, we might be able to keep ourselves healthy without the need for more heavy-handed measures.

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Brian Fung is the technology writer at National Journal. He was previously an associate editor at The Atlantic and has written for Foreign Policy and The Washington Post.

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