Journal of General Internal Medicine

, Volume 26, Issue 6, pp 621–626

Financial Incentives for Extended Weight Loss: A Randomized, Controlled Trial

  • Leslie K. John
  • George Loewenstein
  • Andrea B. Troxel
  • Laurie Norton
  • Jennifer E. Fassbender
  • Kevin G. Volpp
Original Research

DOI: 10.1007/s11606-010-1628-y

Cite this article as:
John, L.K., Loewenstein, G., Troxel, A.B. et al. J GEN INTERN MED (2011) 26: 621. doi:10.1007/s11606-010-1628-y

ABSTRACT

BACKGROUND

Previous efforts to use incentives for weight loss have resulted in substantial weight regain after 16 weeks.

OBJECTIVE

To evaluate a longer term weight loss intervention using financial incentives.

DESIGN

A 32-week, three-arm randomized controlled trial of financial incentives for weight loss consisting of a 24-week weight loss phase during which all participants were given a weight loss goal of 1 pound per week, followed by an 8-week maintenance phase.

PARTICIPANTS

Veterans who were patients at the Philadelphia Veterans Affairs Medical Center with BMIs of 30–40.

INTERVENTION

Participants were randomly assigned to participate in either a weight-monitoring program involving a consultation with a dietician and monthly weigh-ins (control condition), or the same program with one of two financial incentive plans. Both incentive arms used deposit contracts (DC) in which participants put their own money at risk (matched 1:1), which they lost if they failed to lose weight. In one incentive arm participants were told that the period after 24 weeks was for weight-loss maintenance; in the other, no such distinction was made.

MAIN MEASURE

Weight loss after 32 weeks.

KEY RESULTS

Results were analyzed using intention-to-treat. There was no difference in weight loss between the incentive arms (P = 0.80). Incentive participants lost more weight than control participants [mean DC = 8.70 pounds, mean control = 1.17, P = 0.04, 95% CI of the difference in means (0.56, 14.50)]. Follow-up data 36 weeks after the 32-week intervention had ended indicated weight regain; the net weight loss between the incentive and control groups was no longer significant (mean DC = 1.2 pounds, 95% CI, -2.58–5.00; mean control = 0.27, 95% CI, -3.77–4.30, P = 0.76).

CONCLUSIONS

Financial incentives produced significant weight loss over an 8-month intervention; however, participants regained weight post-intervention.

KEY WORDS

behavioral medicineobesitypsychologyrandomized trialsbehavioral economics

Copyright information

© Society of General Internal Medicine 2011

Authors and Affiliations

  • Leslie K. John
    • 1
  • George Loewenstein
    • 1
    • 2
  • Andrea B. Troxel
    • 2
    • 3
  • Laurie Norton
    • 2
    • 4
    • 5
  • Jennifer E. Fassbender
    • 3
  • Kevin G. Volpp
    • 2
    • 4
    • 5
    • 6
  1. 1.Department of Social and Decision SciencesCarnegie Mellon UniversityPittsburghUSA
  2. 2.Center for Health IncentivesLeonard Davis Institute of Health Economics, University of PennsylvaniaPhiladelphiaUSA
  3. 3.Center for Clinical Epidemiology and Biostatistics and Department of Biostatistics and EpidemiologyUniversity of PennsylvaniaPhiladelphiaUSA
  4. 4.Center for Health Equity Research and PromotionPhiladelphia Veterans Affairs Medical CenterPhiladelphiaUSA
  5. 5.Department of MedicineUniversity of Pennsylvania School of MedicinePhiladelphiaUSA
  6. 6.Department of Health Care ManagementThe University of Pennsylvania Wharton SchoolPhiladelphiaUSA