A Behavioral Intervention for Reducing Obesity

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00892788

Enrollment

Registered

2009-05-05

Start date

2009-04-30

Completion date

2010-07-31

Last updated

2019-04-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Obesity, Overweight

Keywords

Overweight, Obesity, Contingency Management

Brief summary

This study will examine a contingency management (CM) intervention designed to provide incentives for losing weight versus participating in a manual-guided behavioral weight loss intervention alone. Participants in the CM condition will earn the opportunity to win prizes by losing weight and completing activities that contribute to weight loss, such as keeping daily food and physical activity diaries, choosing healthy foods, exercising, and using other weight loss strategies. The investigators will determine if the CM improves weight loss relative to the usual care manual-guided intervention alone.

Interventions

BEHAVIORALcontingency management

Prize-based contingency management for weight loss

BEHAVIORALweight loss manual-guided individual therapy sessions

once weekly counseling sessions with research staff

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

NONE

Eligibility

Sex/Gender

ALL

Age

18 Years to 65 Years

Healthy volunteers

Inclusion criteria

* age between 18 and 65 years * body mass index in kg/m2 (BMI) between 30.0 and 39.9 * seated blood pressure of 100/60-140/90 mmHg * ability to speak English and read at the 6th grade level * willingness to be randomly assigned to one of two groups

Exclusion criteria

* any serious acute or chronic medical problems that may impact dietary or exercise regimens or impact weight loss * psychiatric exclusions

Design outcomes

Primary

Measure	Time frame
absolute and relative weight loss	Weeks 1-12
changes in waist circumference	Week 1 and Week 12
proportion of participants achieving clinically significant weight loss (5% or more of baseline weight)	Week 1 and Week 12

Secondary

Measure	Time frame
indices of treatment retention	Weeks 1-12
changes on measures of diet quality, physical activity, and physiological parameters such as blood pressure, lipoproteins, insulin, and glucose levels	Week 1 and Week 12

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026