Testing Just-in-Time Adaptive Interventions (JITAIs) to Prevent Goal Disengagement in Response to Weight Regain (Momentum)

August 7, 2026 updated by: ORI Community and Evaluation Services
This trial will test the effectiveness of a weight loss maintenance intervention designed to help participants respond more adaptively to weight regain. Participants will be randomly assigned to one of two conditions. In one condition, participants will receive brief exercises (e.g., written reflections, videos) sent to through a smartphone app immediately after they regain weight or miss a weigh-in. These exercises will use mindfulness, acceptance, and self-compassion strategies to help participants stay motivated for their long term goals, even when weight regain feels demoralizing. In the comparison condition, participants will receive weekly reminders of standard weight control strategies strategies.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
120

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • Oregon
      • Springfield, Oregon, United States, 97477
        • Recruiting
        • Oregon Research Institute Community and Evaluation Services
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Ages 18-70 years
  • BMI of 25-50 kg/m2
  • Current weight is 3% lower than their highest weight in the past 3 years
  • Desire to maintain their weight or lose more
  • Ability to engage in PA, as defined as being able to walk two full city blocks without stopping
  • Smartphone and Internet access
  • Successful completion of all enrollment procedures
  • Ability to attend a workshop(s) on a Monday or Tuesday evening

Exclusion Criteria:

  • History of bariatric surgery
  • History of being diagnosed with an eating disorder
  • Currently pregnant, breastfeeding, or planning to become pregnant in the next 24 months
  • Enrolled in another formal weight loss/weight maintenance program
  • Currently taking a GLP-1 medication.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: JITAI Condition
Participants in this condition will receive a 6-month weight loss maintenance intervention that uses mindfulness, acceptance, and self-compassion strategies to respond to weight regain.
Behavioral: JITAI Combined with psychological intervention
For six months, participants will receive a just-in-time adaptive interventions via a smartphone app immediately after they gain weight or they skip a weigh-in (according to a specific algorithm). Interventions will engage participants in mindfulness, acceptance, and self-compassion-based (MASC) strategies through different modalities (e.g., writing exercises, videos, audio reflections). They will take approximately 1-10 minutes. Participants will also attend an introductory workshop, during which they will receive the instructions weigh daily, learn the importance of quickly responding to weight regain, and be introduced to MASC strategies. They will also attend two booster workshops during the 6-month period.
Active Comparator: Active Control Condition
Participants in this condition will receive minimal intervention designed to reflect "usual care" for weight loss maintenance.
Behavioral: Active Control
For six months, participants will receive weekly, automated messages via a smartphone app with reminders of standard behavioral weight control principles. Participants will attend an introductory workshop, during which they will receive instructions to weigh daily and learn the importance of responding to weight regain.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
State negative affect
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their current negative affect.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
State shame
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their current shame.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
State Motivation
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their current feelings of motivation.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
State Self-Efficacy
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their current self-efficacy.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
Current confidence in the effectiveness of weight control behaviors
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their current confidence in the effectiveness of weight control behaviors.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
State self-compassion
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their state self-compassion.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
State mindfulness
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their state mindfulness.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
State acceptance
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their state acceptance.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
Self-serving interpretation of weight gain
Time Frame: Whenever participants regain weight during the 6 month study period
Through ecological assessment surveys, participants will respond to a single item measuring their self-serving interpretation of the weight regain.
Whenever participants regain weight during the 6 month study period
Daily Calorie Tracking (Yes/No)
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Whether participants log their calories (at least 800 calories) using a dietary tracking app that day (yes/no).
Whenever participants skip a weigh-in or regain weight during the 6 month study period
Daily MVPA
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Minutes of moderate-to-vigorous physical activity they engage in that day, as tracked by their Fitbit band.
Whenever participants skip a weigh-in or regain weight during the 6 month study period
Likelihood of weighing in the following day
Time Frame: Whenever participants skip a weigh-in or regain weight during the 6 month study period
Likelihood that participants weigh themselves the following day on a wireless smart scale (yes/no).
Whenever participants skip a weigh-in or regain weight during the 6 month study period
Calorie Tracking Frequency
Time Frame: 6 months (duration of study period)
The number of days that participants logged their calories (at least 800 calories) using a dietary tracking app during the study period.
6 months (duration of study period)
Average Weekly MVPA
Time Frame: 6 months (duration of study period)
Average total minutes of weekly moderate-to-vigorous physical activity, as tracked by their Fitbit band, during the study period.
6 months (duration of study period)
Frequency of Weighing In
Time Frame: 6 months (duration of study period)
Total number of days that participants weighed themselves on a wireless smart scale during the study period.
6 months (duration of study period)
Weight change
Time Frame: End of treatment (6 months after baseline)
Using participants' weights from a wireless scale, their percent weight change from the beginning to the end of the study period will be calculated.
End of treatment (6 months after baseline)
Intervention acceptability
Time Frame: End of treatment (6 months after baseline)
Intervention acceptability will be operationalized as the percent of participants who indicate that they are "satisfied" or "very satisfied" with the program on an anonymous survey that they complete during their individual interview.
End of treatment (6 months after baseline)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Mindfulness (Hypothesized intervention mediator)
Time Frame: Mid-Treatment (3 months after baseline)
Participants will self-report their mindfulness using the Awareness subscale of The Philadelphia Mindfulness Scale. The range of scores is 1-5, with higher scores indicating greater mindfulness.
Mid-Treatment (3 months after baseline)
Acceptance (Hypothesized intervention mediator)
Time Frame: Mid-Treatment (3 months after baseline)
Participants will self-report their mindful acceptance using the Acceptance subscale of The Philadelphia Mindfulness Scale. The range of scores is 1-5, with higher scores indicating greater mindful acceptance.
Mid-Treatment (3 months after baseline)
Self-compassion (Hypothesized intervention mediator)
Time Frame: Mid-Treatment (3 months after baseline)
Participants will report their self-compassion using the Self-Compassion Scale Short Form. Scores can range from 1 to 5, with higher scores indicating higher self-compassion.
Mid-Treatment (3 months after baseline)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
ORI Community and Evaluation Services

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 14, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 31, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 12, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 12, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 16, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 11, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 7, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • K01HL172254 (U.S. NIH Grant/Contract)

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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