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The 16-Hour fast: does Time-Restricted eating beat calorie counting?

NCT ID NCT04692532

Disease control Sponsor: University of Illinois at 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 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 27, 2026 · Last updated Jul 28, 2026 · Updated 1 time

Summary

This 12-month trial compares two weight-loss strategies in adults with obesity: eating only between 12 pm and 8 pm each day (an 8-hour time-restricted eating window) versus reducing daily calories by 25%. A control group follows no specific diet. The study measures changes in body weight, fat mass, and insulin resistance over 6 months of weight loss and 6 months of weight maintenance.

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 eating (eating only between 12 pm and 8 pm) and calorie restriction (25% fewer calories daily)
What this could lead to
If effective, time-restricted eating could offer a simpler alternative to daily calorie counting for weight management.
What could go wrong
This is a single-center trial with 90 participants, so results may not apply broadly. Long-term adherence to an 8-hour eating window may be challenging.

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

90 people

The number who actually took part.

Started

Jan 2021

Finished

Feb 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

18 to 65 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 between 18 to 65 years old * BMI between 30 and 50 kg/m2 * Sedentary or lightly active (\<60 minutes/week of light activity for the 3 months prior to the study) Exclusion criteria: * • Type 1 DM or Type 2 DM * History of eating disorders (anorexia, bulimia, or binge eating disorder) * Are not weight stable for 3 months prior to the beginning of study (weight gain or loss \> 4 kg) * Are not able to keep a food diary or activity log for 7 consecutive days during screening * Are taking drugs that influence study outcomes (weight loss, glucose-lowering medications) * Are perimenopausal or have an irregular menstrual cycle (menses that does not appear every 27-32 days) * Are eating within less than a 10-hour window at baseline * Are pregnant, or trying to become pregnant * Are night shift workers * Are smokers

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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

  • University of Illinois Chicago

    Chicago, Illinois, 60612, United States

More trials for these conditions

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