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NCT Number: NCT07708064

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

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.

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Key information

Conditions

Overweight or Obesity Body Weight Nutrition Disorders Nutritional and Metabolic Diseases Obesity Overnutrition Overweight Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

18 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Oregon Research Institute Community and Evaluation Services

Springfield, Oregon, 97477, United States

Location status: Recruiting

Location contact

Charlotte Hagerman, PhD

CONTACT

[email protected]

4109372035

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

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.

Treatment and study plan

JITAI Combined with psychological intervention

Behavioral

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 Control

Behavioral

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.

Primary outcomes

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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).

  11. 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.

  12. 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).

  13. Weight change

    Time frame: End of treatment (6 months after baseline)

    Using participants' weights from a wireless scale, we will calculate their percent weight change from the beginning to the end of the study period.

  14. Intervention acceptability

    Time frame: End of treatment (6 months after baseline)

    We will record 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.

  15. 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.

  16. 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.

  17. 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.

Secondary outcomes

  1. Mindfulness (Hypothesized intervention mediator)

    Time frame: Mid-Treatment (3 months after baseline)

    Participants will self-report their mindfulness using the present moment awareness subscale of the Philadelphia Mindfulness Scale.

  2. 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.

  3. Self-compassion (Hypothesized intervention mediator)

    Time frame: Mid-Treatment (3 months after baseline)

    Participants will report their self-compassion using the State Self-Compassion Scale.

Study contacts

Contact information is provided by the study sponsor or research team.

Charlotte Hagerman, PhD

CONTACT

[email protected]

14109372035

Sponsors and collaborators

Lead sponsor

ORI Community and Evaluation Services

Other

Registry information

Acronym: Momentum

Important dates

Study start
2026
Primary completion
2027
Study completion
2027
First posted
Jul 16, 2026
Registry last updated
Jul 16, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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