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What keeps weight off? scientists track daily habits years after dieting

NCT ID NCT03840733

Knowledge-focused Sponsor: University of Colorado, Denver Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only This study
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study follows 60 adults who completed a weight loss program 3 years ago. Researchers will measure their weight, body fat, physical activity, sleep, and eating patterns to see how these habits relate to keeping weight off. Participants wear activity trackers and use a phone app to log meals for 28 days.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this study could reveal which daily habits (like exercise timing or sleep) help people keep weight off long-term, pointing to better weight maintenance strategies.
What could go wrong
This is an observational follow-up, not a treatment trial, so it cannot prove cause and effect. Results may not apply to people who didn't join the original weight loss program.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 60 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jan 2019

Expected to finish

Jan 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Participants previously enrolled in an 18-month behavioral weight loss intervention at the University of Colorado Anschutz Medical Campus. (NCT01985568)

Ages

18 to 60 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Previous enrollment in standard behavioral weight loss intervention (NCT01985568 or NCT03411356) * Age 20-60 (This age range has been selected based upon the participants enrolled in the Parent Trial) * Capable and willing to give informed consent * Possess a smartphone to install and utilize the meal timing application * Capable and willing to wear the Actigraph, ActivPAL and Actiwatch-2 for 24 hours/day for 28 consecutive days * Willing to complete the Total Daily Energy Expenditure (TDEE) assessment which includes multiple urine collections and drinking stable water isotopes Exclusion Criteria: * Being considered unsafe to participate as determined by the study physician (Dr. Catennaci) * New diagnosis of a medical condition (not observed in the Parent Trial) which may affect weight or energy metabolism (e.g. depression, CVD, diabetes, uncontrolled hypertension, untreated thyroid, renal, hepatic diseases) * Women who became pregnant after completing the Parent Trial * Current use or use within the last 6 months of prescription or over-the-counter medications known to affect appetite, weight, and sleep

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Conditions

The condition(s) this trial relates to.

Body Weight Changes Motor Activity Obesity obesity disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Obesity Weight change, body

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • University of Colorado Anschutz Medical Campus

    Aurora, Colorado, 80045, United States

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