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When you eat may matter as much as what you eat

NCT ID NCT03647306

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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at how the timing of meals changes the way your body uses energy, especially in overweight adults aged 30 to 75. Researchers will compare eating most calories early versus late in the day, and test how this affects insulin sensitivity and metabolism. The goal is to understand if meal timing can help prevent or manage type 2 diabetes and heart disease.

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 help design better dietary guidelines for managing type 2 diabetes and heart disease risk.
What could go wrong
This is an observational behavioral study, not a treatment trial. Results may not lead to direct medical advice or apply to all populations.

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 200 people

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

Started

Feb 2018

Expected to finish

Jan 2027

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

30 to 75 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: * Healthy overweight and obese (25 kg/m2 ≤BMI\< 40 kg/m2) men and women * aged 30-75 years * self-report sleeping at least 6.5-hrs/night but no more than 9-hrs/night, between 21:00 and 09:00 * signed informed consent Exclusion Criteria: * participation in a medically managed weight loss program within the past year * undergone bariatric surgery * dietary restrictions * Subjects will not have undergone surgery, donated a unit of blood, worked night shifts or crossed any time zones, or participated in another clinical study within a month prior to the study. * pregnancy in women * lactating women * Female subjects must not be actively going through menopause. * prisoners * inability to consent * members of the study team * Females with a hemoglobin \< 11.5g/dL, and males with a hemoglobin \< 13.5 g/dl will be excluded from the study. * presence of a sleep disorder such as moderate or severe sleep apnea (AHI≥15), a Circadian Rhythm Sleep Disorder (DSM-V criteria for advance sleep phase syndrome, delayed sleep phase syndrome, non 24-h sleep disorder, irregular sleep disorder and shift-work related sleep disorder), * a diagnosis of diabetes based on history or screening tests * other forms of endocrine dysfunction including PCOS; * a history of cognitive or other neurological disorders; * a history of major psychiatric disorder based on DSM-V criteria, * the presence of unstable or serious medical conditions, * any GI disease that requires dietary adjustment; * current, or use within the past month of melatonin, psychoactive, hypnotic, stimulant or pain medications (except occasionally); beta blockers; habitual smoking (6 or more cigarettes per week); caffeine consumption of greater than 500 mg per day

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Conditions

The condition(s) this trial relates to.

cardiovascular disorder type 2 diabetes mellitus

As listed by the trial registrant

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

Cardiovascular diseases TYPE2 diabetes mellitus

Contacts and locations

Locations

  • University of Chicago

    Chicago, Illinois, 60637, United States

More trials for these conditions

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