NCT05625061Completed
Just-in-time Adaptive Intervention Messaging in a Digital Weight Loss Intervention for Young Adults
A Micro-randomized Trial of JITAI Messaging to Improve Adherence to Multiple Weight Loss Behaviors in Young Adults
Source: ClinicalTrials.gov · Last updated 17 Feb 2026
Brief summary (registry, in English)
The purpose of this micro-randomized trial is to evaluate the effects of 7 types of intervention messages targeting specific behavior change techniques (i.e., BCT messages) delivered in "just-in-time" (JIT) moments on daily achievement of weight-related behavioral goals among n=201 young adults with overweight and obesity, participating in a digital, mobile comprehensive lifestyle intervention. "Just-in-time adaptive interventions" (JITAIs) are an alternative to the "one size fits all" approach of mobile intervention development that can provide tailored, real-time messaging and support for young adults.
- Status (registry)
- Completed
- Study type
- Interventional
- Enrollment
- 255 (actual)
- First submitted
- 14 Nov 2022
- Start date
- 25 Aug 2023
- Primary completion date
- 5 Jan 2025
- Lead sponsor
- University of North Carolina, Chapel Hill
- Diseases
- Obesity
- NCT number
- NCT05625061
What you commit to
- Study type: Interventional
- Participants enrolled: 255
- From 25 Aug 2023 to the primary completion date, 5 Jan 2025
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Type 1 diabetes or currently receiving medical treatment for Type 2 diabetes
- Past diagnosis of or receiving treatment for a clinically diagnosed eating disorder (anorexia nervosa or bulimia nervosa)
- Currently using prescription medications with known effects on appetite or weight (e.g., oral steroids, weight loss medications), with the exception of individuals on a stable dose of Selective Serotonin Reuptake Inhibitors (SSRIs) for 3 months)
- Previous surgical procedure for weight loss or planned weight loss surgery in the next year
Other illness
- Report a heart condition, chest pain during periods of activity or rest, or loss of consciousness on the Physical Activity Readiness Questionnaire (PAR-Q; items 1-4).
- Other health problems which may influence the ability to walk for physical activity or be associated with unintentional weight change, including cancer treatment within the past 5 years or tuberculosis
- Untreated thyroid disease or any changes (type or dose) in thyroid medication in last 6 months
- Hospitalization for depression or other psychiatric disorder within the past 12 months
- History of psychotic disorder or bipolar disorder
Other
- Lost 10 lbs. or more of body weight (and kept it off) in the last 6 months
- Current symptoms of alcohol or substance dependence
- Currently pregnant, pregnant within the past 6 months, or planning to become pregnant within the next 6 months
- Currently participating in a weight loss, nutrition, or physical activity study or program or other study that would interfere with this study
- Another member of the household is a participant or staff member on this trial
- Reason to suspect that the participant would not adhere to the study intervention
- Reside outside of the United States
- Have participated in another study conducted by the UNC Weight Research Program within the past 12 months
Who the study is looking for
- Body mass index (BMI) of 25 - 45 kg/m\^2 at baseline
- English-speaking, reading, and writing
- Own a smartphone with a data and text messaging plan
Age in the registry: 18 years to 39 years · Sex: All · Does not accept healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| University of North Carolina at Chapel Hill Coordinator of this site? Confirm its status | Chapel Hill | United States | Unknown status |
Related publications
- Promoting adherence to weight-related behaviors in young adults: Design of the Nudge microrandomized trial.Contemp Clin Trials · 2026 · PMID 41997542
This page is information, not medical advice. Discuss any trial with your doctor.