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Timing your meals may ward off diabetes, study finds

NCT ID NCT03504683

Prevention Sponsor: University of Alabama at Birmingham Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 limiting when you eat (time-restricted eating) can improve blood sugar control and heart health in adults with prediabetes. 108 participants were assigned to eat only between 8am-3pm, 1pm-8pm, or a normal 12-hour eating window for 8 weeks. All meals were provided. The goal was to see if changing meal timing alone, without changing what you eat, can help prevent type 2 diabetes.

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

108 people

The number who actually took part.

Started

Aug 2020

Finished

Nov 2025

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 70 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: * Aged 30-70 years old * Prediabetic as determined by HbA1c between 5.7-6.4% or fasting glucose between 100-125 mg/dl with HbA1c \>= 5.1% * Fasting insulin less than 100.0 mU/l and, if HbA1c \<5.7%, must also have fasting insulin \>= 8.0 mU/l * BMI between 30-60 kg/m\^2 * Wake up at a regular time between 5-8 am Exclusion Criteria: * Been diagnosed with diabetes or on diabetes medication or any medication known to affect glucose or 24-hour rhythms in blood pressure * On weight loss medication * Change in the dosage of a chronic medication within the past 2 months * Have a clinically significant laboratory abnormality (e.g., abnormal hemoglobin levels) * Significant gastrointestinal disease, major gastrointestinal surgery, or gallstones * Significant cardiovascular, renal, cardiac, liver, lung, adrenal, or nervous system disease that might compromise the participant's safety or data validity * Evidence of cancer (other than non-melanoma skin cancer) within the last 5 years * Pregnant or breastfeeding * Diagnosed psychiatric conditions * Sleep disorder, circadian disorder, or regularly sleep less than 6 hours per night * Major change in health or medical history in the past 3 months * Currently perform overnight shift work * Regularly eat within a \<10.5-hour period each day * Lost or gained more than 4% of weight in the past 2 months * Traveled more than 2 time zones away in the 2 months prior to enrolling in this study * Will travel outside the Central time zone in the 2 weeks prior to testing * Will travel more than 1 time zone away during this study * Behavioral factors or other circumstances that may make it difficult for you to follow the study requirements

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Conditions

The condition(s) this trial relates to.

prediabetes syndrome

As listed by the trial registrant

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

Prediabetes

Contacts and locations

Locations

  • University of Alabama at Birmingham

    Birmingham, Alabama, 35294, United States

More trials for these conditions

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