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Can eating only during an 8-Hour window beat calorie counting?

NCT ID NCT04259632

Disease control Sponsor: University of Minnesota 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether limiting food intake to an 8-hour daily window (time-restricted eating) works as well as reducing daily calories by 15% for weight loss. 115 obese adults with insulin resistance participated for 12 weeks. Researchers measured changes in weight, body fat, and visceral fat to see if the fasting approach is a practical alternative.

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 (8-hour daily eating window)
What this could lead to
If effective, this could offer a simpler weight-loss option that people may stick with better than traditional calorie counting.
What could go wrong
This is a small, completed study with only 115 participants. Results may not apply to everyone, and long-term effects or adherence beyond 12 weeks are unknown.

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

115 people

The number who actually took part.

Started

Oct 2020

Finished

Dec 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

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: * BMI ≥30 and ≤ 55 kg/m\^2 * Own a smartphone compatible with the myCircadianClock (mCC) phone application * Self-reported habitual wakening between 5-9 am * Self reported sleep duration of 6-9 hours * Weight must be stable \[+/- 5 pounds\] for at least 3 months prior to the study * Eating window (time between 1st food intake and last food take) ≥14 hours using mCC * Insulin resistance based on HOMA-IR≥ 2.5 from screening visit results * Able to understand English Exclusion Criteria: * Use of beta-blockers or medications known to affect weight, such as thiazolidinedione (TZD), insulin, glucagon-like peptide (GLP)-1 agonists, phentermine, or sibutamine * Shift work (i.e. working from 11pm to 7am) * Clinically significant medical issues (diabetes, cardiovascular disease, uncontrolled pulmonary disease) * A history of abnormal laboratory results, such as hematologic (platelets \< 100), hepatic (LFTs \> 2X nl), renal (Cr \> 1.5) * MRI contraindication (metal in body, claustrophobia) * Eating window \< 12 hours per day * Unable to consistently document food intake using the mCC app (need at least 2 eating occasions\> 6 hours apart on a given day for at least 50% of days) * Pregnancy * Illiteracy * Concern for active eating disorder per screening questionnaire * Self-reported eating disorder or history of eating disorder

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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 Minnesota

    Minneapolis, Minnesota, 55455, United States

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