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Study on eating timing and obesity risk canceled before it began

NCT ID NCT03000803

Knowledge-focused Sponsor: University of Chicago 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
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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 aimed to understand how the timing of meals changes daily patterns of natural chemicals in the body that influence eating for pleasure and energy use. It planned to enroll healthy adults without sleep or metabolic disorders. However, the study was withdrawn before any participants were enrolled, so no results are available.

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.

Expected to start

Oct 2026

An estimate. Start dates often move.

Expected to finish

Oct 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

21 to 50 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * self-report sleeping between 7-hrs/night and 9-hrs/night, between 22:00 and 08:00 * no previously diagnosed sleep disorders (including obstructive sleep apnea (OSA)) * no existing diagnosis of prediabetes or diabetes * no history of endocrine dysfunction * no history of psychiatric, cardiovascular, or eating disorders * must not have a gastro-intestinal disease that requires dietary adjustment * currently taking no medications (including birth control) Exclusion Criteria: * drug and nicotine use, habitual alcohol use of more than 2 drinks per day, and caffeine intake of more than 300 mg per day * anyone who has participated in medically managed weight loss program within the past year * anyone who has undergone bariatric surgery * must not have dietary restrictions * must not work night shifts or crossed any time zones in the month prior to the study.

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Conditions

The condition(s) this trial relates to.

Obesity obesity disorder

As listed by the trial registrant

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

Obesity

More trials for these conditions

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