But the even greater challenge, Volpp says, will be keeping the weight off.

但沃尔普表示，更大的挑战是维持体重。

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Kevin Volpp, who directs the Center for Health Incentives at the University of Pennsylvania.

宾夕法尼亚大学健康激励中心负责人Kevin Volpp博士说。

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However, Dr Volpp sounds a note of caution.Companies with programmes that flop are less likely to broadcast their results.

不过Volpp博士指出，值得注意的是健康计划失败的公司不太可能公布结果。

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Volpp says incentive programs to help people stop smoking seem to work better than those focused on losing weight.

VOA: standard.2010.07.16

Volpp says more studies are needed to measure the real impact of incentive programs on obesity.

VOA: standard.2010.07.16

Kevin Volpp,director of the University of Pennsylvania's Center for Health Incentives, says these programs make it easier to take that first step to change.

VOA: standard.2010.07.16

Volpp believes that regret was an important force in the lottery portion of the study.

FORBES: Helping Employees to Be Healthier: How About a Sweepstakes?

The system could make sense for insurance companies and workplace weight-loss programs, says Dr. Volpp.

CNN: When money's at stake, dieters have more weight-loss success

That said, Volpp encourages employers to roll out lottery programs carefully, and to constantly monitor their effectiveness.

FORBES: Helping Employees to Be Healthier: How About a Sweepstakes?