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Timing your meals could change how your body burns fat

NCT ID NCT03354169

Knowledge-focused Sponsor: University of Pennsylvania 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at whether eating the same number of calories at different times of day affects weight, body fat, and metabolism in people with obesity. Thirty-eight adults were given all their meals and snacks to eat either during the daytime or later in the day. The goal was to understand how meal timing might influence body weight and energy use.

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

38 people

The number who actually took part.

Started

Feb 2018

Finished

Mar 2023

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: * age 21-50 * BMI of 30-50 kg/m2 * stable weight (±10 lb) over the previous 6 months * women must be pre-menopausal with regular menstrual cycles Exclusion Criteria: * unstable, serious medical conditions * use of medicine linked to weight gain/loss * cardiac conditions * cancer * diabetes * autoimmune disease * use of illicit drugs, melatonin, diuretics or hypnotics * involved in a current weight loss program * presence of an untreated sleep disorder (determined by surveys and actigraphy) * those who work shift work * those with extreme chronotypes * habitual waking outside of 0600h-0930h * habitual bedtime \<2200h or \>2400h * sleep duration of \<6.5 or \>8.5 h/night. * psychiatric exclusions will be: depression (Patient Health Questionnaire-9 score ≥9), lifetime bipolar disorder, psychosis, or eating disorder; or any other severe psychiatric disorder judged to interfere with study adherence as assessed by the MINI International Neuropsychiatric Interview. * structured exercise \>3 d/wk, for \>30 min measured by exercise logs and actigraphy; normal activity levels are required during the study (±30 min/wk of baseline level).

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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

Contacts and locations

Locations

  • Center for Weight and Eating Disorders, Perelman School of Medicine, University of Pennsylvania

    Philadelphia, Pennsylvania, 19104, United States

More trials for these conditions

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