Study of the Day: Like Obesity, Weight Loss Can Be Contagious

Teammates in a dieting challenge significantly improved each other's outcomes, suggesting that shedding pounds can have a ripple effect.

main Everett Collection shutterstock_93940780.jpg

PROBLEM: Obesity remains a common, deadly, and costly disease in the U.S. It affects one in three American adults and its associated health problems, including heart disease and diabetes, cost the nation hundreds of billions of dollars each year. Can team-based weight loss interventions help?

METHODOLOGY: Researchers from Brown University analyzed the results of the 2009 Shape Up Rhode Island campaign, a 12-week online weight loss competition where participants joined a team and competed in three divisions: weight loss, physical activity, and pedometer steps. The contest included 3,330 overweight or obese people or 987 teams.

RESULTS: Competition outcomes were most determined by the teams the participants were in. Those who lost clinically significant amounts of weight or at least five percent of their initial body weight tended to be on the same teams. Members who reported more teammate influence also increased their odds of achieving this level of weight loss by 20 percent.

CONCLUSION: Social influences can fuel weight loss.

IMPLICATION: Being surrounded by the right people when dieting matters. Lead author Tricia Leahey explains in a statement that they may provide accountability, help set expectations of weight loss, and provide encouragement and support.

SOURCE: The full study, "Teammates and Social Influence Affect Weight Loss Outcomes in a Team-Based Weight Loss Competition," is published in the journal Obesity.

Image: Everett Collection/Shutterstock.

Presented by

Hans Villarica writes for and produces The Atlantic's Health channel. His work has appeared in TIME, People Asia, and Fast Company.

What LBJ Really Said About Selma

"It's outrageous what's on TV. It looks like that man is in charge of the country."

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register with Disqus.

Please note that The Atlantic's account system is separate from our commenting system. To log in or register with The Atlantic, use the Sign In button at the top of every page.

blog comments powered by Disqus

Video

What LBJ Really Said About Selma

"It's going to go from bad to worse."

Video

Does This Child Need Marijuana?

Inside a family's fight to use marijuana oils to treat epilepsy

Video

A Miniature 1950s Utopia

A reclusive artist built this idealized suburb to grapple with his painful childhood memories.

Video

Why Principals Matter

Nadia Lopez didn't think anybody cared about her school. Then the Internet heard her story.

More in Health

Just In