Researchers from The Miriam Hospital have found that DietBet, a web-based commercial weight loss program that pairs financial incentives with social influence, delivers significant weight losses. The study and its findings have been published in the current issue of the open access publication JMIR Serious Games.

Tricia Leahey, Ph.D., lead researcher at The Miriam Hospital Weight Control and Diabetes Research Center, sought to examine weight losses associated with the social gaming website and contributing factors to gauge the success of such web-based programs.

On Dietbet.com, players join a game to lose weight while betting money on themselves. Players all have four weeks to lose four percent of their starting weight. At the end of week four, all players who have lost at least four percent of their initial body weight are deemed “winners” and split the pool of money collected at the start of the game. To verify weight losses, players submit photo-based evidence of their weigh-ins to DietBet’s referees at the start and end of each game.

“Online social weight loss programs are accessible to large numbers of overweight and obese individuals who want to lose weight,” Leahey says, “but there has been little research to date on whether such programs are effective, or just how much weight loss they generate.”

Leahey studied nearly 40,000 DietBet players over the course of seven months. She found that winners lost an average of 4.9 percent of their initial body weight and won an average of $59 in four weeks. Factors associated with winning the game included betting more money, sharing on Facebook, completing more weigh ins, and engaging in more social interactions with the other players. Interestingly, weight losses tended to cluster within games, suggesting that players tended to influence and motivate each other.

The Miriam Hospital study found that by using financial incentives and creating social networks around weight loss, websites like DietBet.com may provide a convenient, cost-effective solution to people who need to lose weight.

“Research evaluating the effectiveness of web-based weight-loss programs is rare,” Leahey adds, “and this study could help consumers lose weight together as part of a web-based community.”

“This study backs up in a scientific way what we’ve been seeing all along, which is that players in our DietBet game get meaningful motivation and support from a combination of competition, collaboration, and financial incentives,” said Jamie Rosen, DietBetter’s founder and CEO. “Plus, it’s a lot of fun.”

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Leahey’s primary affiliation is The Miriam Hospital. She is also an assistant professor (Research) of Psychiatry and Human Behavior) at The Warren Alpert Medical School of Brown University.

About The Miriam Hospital

The Miriam Hospital is a 247-bed, not-for-profit teaching hospital affiliated with The Warren Alpert Medical School of Brown University. It offers expertise in cardiology, oncology, orthopedics, men’s health, and minimally invasive surgery and is home to the Rhode Island’s first Joint Commission-certified Stroke Center and robotic surgery program and the only kidney stone center in the state. The hospital, which received more than $23 million in external research funding last year, is nationally known for its HIV/AIDS and behavioral and preventive medicine research, including weight control, physical activity and smoking cessation. The Miriam Hospital has been awarded Magnet Recognition for Excellence in Nursing Services four times and is a founding member of the Lifespan health system.

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Elena Falcone-Relvas
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