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Body clock diet: could aligning meals with teen sleep cycles boost weight loss?

NCT ID NCT07759414

Disease control Sponsor: University of Thessaly 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 This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 12, 2026 · Last updated Aug 13, 2026 · Updated 1 time

Summary

This trial tests whether time-restricted feeding—eating all meals within a 16-hour fasting window—helps adolescents with overweight or obesity lose weight, and whether matching meal times to a teen's natural chronotype (early vs. late) makes a difference. About 120 teens aged 12-18 with a late chronotype will be randomly assigned to an early eating schedule, a late eating schedule, or a control group with calorie restriction only. The study tracks changes in weight, body fat, and quality of life over 12 weeks to see if personalized meal timing improves weight loss outcomes.

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 feeding (intermittent fasting) with a Mediterranean diet, either early (meals at 10:00, 14:00, 18:00) or late (meals at 14:00, 18:00, 22:00), compared to calorie restriction alone.
What this could lead to
If successful, this could show that matching meal timing to a teen's natural sleep-wake cycle makes weight loss more effective, paving the way for personalized dietary plans for adolescent obesity.
What could go wrong
This is a small, early-stage trial, and results may not apply to all teens. The main risks are temporary hunger, fatigue, or mild discomfort from fasting, and the study does not yet prove long-term effectiveness.

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

About 120 people

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

Expected to start

Jan 2027

An estimate. Start dates often move.

Expected to finish

Sep 2029

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.

Ages

12 to 18 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 are: * Adolescents aged 12-18 years. * Screening for overweight/obesity, defined according to the World Health Organization (WHO) Growth Reference for School-aged Children and Adolescents (5-19 years) as a body mass index (BMI)-for-age z-score \> +1 Standard Deviation (SD) * Late chronotype, assessed using the Morningness-Eveningness Questionnaire (rMEQ) in Greek language * Provision of verbal assent from the participants and written informed consent from participants and their parents/guardians. Exclusion criteria are: * Early or intermediate chronotype, assessed using the rMEQ questionnaire in Greek language. * Presence of chronic medical conditions affecting metabolism (i.e., diabetes mellitus, thyroid disorders). * Use of medications that may influence body weight, appetite, or metabolism. (i.e. thyroxin or other thyroid medication, metformin, glpi1 analogs, estrogens, progesterone, testosterone, antidepressants) * Diagnosed eating disorders. * Participation in another clinical trial or structured weight loss program.

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Conditions

The condition(s) this trial relates to.

Intermittent Fasting Obesity obesity disorder

As listed by the trial registrant

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

Obesity

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

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    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

  • Private Endocrine Center

    Larissa, Thessaly, Greece

More trials for these conditions

Other studies related to the condition(s) this trial covers.