Peer Support for Weight Loss Maintenance

Study Overview
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Brief Summary
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The primary aim of this study is to test the efficacy of patient-provided treatment for weight-loss maintenance.

Official Title
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Peer Support for Weight Loss Maintenance

Conditions
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Obesity

Intervention / Treatment
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* Behavioral: Peer-delivered Weight Maintenance
* Behavioral: Professionally-Delivered Weight Maintenance


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age between 18-75 Body Mass Index between 25-50 English Speaking Exclusion Criteria: Report being unable to walk 2 blocks without stopping Are currently participating in weight loss treatment, have a history of bariatric surgery, or lost ≥5% in the past 6-months Are pregnant or plan to become pregnant within 1 year Report a heart condition, chest pain during periods of rest or activity, or loss of consciousness on the Physical Activity Readiness Questionnaire Report a medical condition that could jeopardize their safety in a weight control program with diet and exercise guidelines Report conditions that, in the judgment of the PI, would render them unlikely to follow the protocol (e.g., relocation, dementia, unable to read and write in English) Have no Internet access.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Peer-Delivered Weight Maintenance<br>Contingent upon participants losing 5% of body weight or more in Phase I (weight loss) of this trial, participants will receive an 18-month patient-delivered behavioral weight maintenance intervention. Specifically, group sessions will be delivered by a mentor (i.e., successful weight loser) and weekly coaching will be delivered by a peer (other member of their weight maintenance group). | Behavioral: Peer-delivered Weight Maintenance<br>* Contingent upon participants losing 5% of body weight or more in Phase I (weight loss) of this trial, participants will receive an 18-month patient-delivered behavioral weight maintenance intervention. Specifically, group sessions will be delivered by a mentor (i.e., successful weight loser) and weekly coaching will be delivered by a peer (other member of their weight maintenance group).<br>|
| Active Comparator: Professionally-Delivered Weight Maintenance<br>Contingent upon participants losing 5% of body weight or more in Phase I (weight loss) of this trial, participants will receive an 18-month reduced intensity behavioral weight maintenance intervention, delivered by a professional. The intervention will consist of 24 group sessions. | Behavioral: Professionally-Delivered Weight Maintenance<br>* Contingent upon participants losing 5% of body weight or more in Phase I (weight loss) of this trial, participants will receive an 18-month reduced intensity behavioral weight maintenance intervention, delivered by a professional. The intervention will consist of 24 group sessions.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Weight Change (kg) | Weight change (measured on a digital scale to the nearest 0.1-kilogram) from the end of the Phase I weight loss program to the end of the Phase II maintenance program, which is 18 months long. | Baseline to 18-months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Blood pressure (mmHg) | Blood pressure (mmHg) from the end of the Phase I weight loss program to the end of the Phase II maintenance program, which is 18 months long. | Baseline to 18-months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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weight loss, weight maintenance, weight control, peer support, patient-provided care