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Does the clock matter? testing early vs. late eating windows for teen weight loss

NCT ID NCT05740254

Disease control Sponsor: Children's Hospital Los Angeles 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
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 31, 2026 · Last updated Sep 01, 2026 · Updated 1 time

Summary

This trial tests whether limiting eating to an early window (7 AM to 3 PM) or a late window (12 PM to 8 PM) helps adolescents with obesity lose weight and lower their body mass index. Participants aged 12 to 21 with obesity will follow one of these eating schedules for 24 weeks. Researchers will measure changes in weight, body fat, and blood sugar control to see if the timing of meals makes a difference.

What this could mean

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

Active substance
Time-restricted eating (behavioral intervention)
What this could lead to
If it works, this could offer a simple, drug-free way for teens with obesity to lose weight and improve metabolic health.
What could go wrong
The trial is small and early, and results may not apply to all teens. Sticking to a strict eating window can be hard, and the approach may not produce lasting weight loss.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

94 people

The number who actually took part.

Started

Mar 2023

Finished

Jun 2026

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.

Ages

12 to 21 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: * 12-21 years with obesity (BMI\>95th percentile) * participant must be willing and able to adhere to the assessments, visit schedules, and eating/fasting periods * baseline eating window greater than 12 hours. Exclusion Criteria: * diagnosis of Prader-Willi Syndrome, brain tumor, or diabetes serious intellectual disability * previous diagnosis or subthreshold symptoms of an eating disorder (anorexia nervosa, bulimia nervosa, binge-eating disorder) * parent/guardian-reported physical, mental of other inability to participate in the assessments * previous bariatric surgery * current participation in other interventional weight loss studies.

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Conditions

The condition(s) this trial relates to.

Intermittent Fasting Obesity obesity disorder Pediatric Obesity

As listed by the trial registrant

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

Pediatric obesity Time restricted feeding Time-restricted eating

Contacts and locations

Locations

  • Children's Hospital Los Angeles

    Los Angeles, California, 90027, United States

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