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Fasting for 24 hours: scientists peer inside your immune system

NCT ID NCT07527208

Knowledge-focused Sponsor: Cornell University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 11, 2026 · Updated 2 times

Summary

This study looks at what happens to your immune cells when you fast for 24 hours. Researchers want to understand how the body's switch from using sugar to burning fat for energy changes the way immune cells work. The study involves 28 healthy adults aged 18-40. No treatment or drug is being tested—only the effects of fasting are measured.

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

28 people

The number who actually took part.

Started

Jun 2026

Finished

Sep 2026

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 40 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: * Apparently healthy * Age 18-40y at the time of recruitment * BMI ≥ 18.5 and ≤ 24.9 kg/m2 * Willing to participate in all study activities during the 3-day intervention * Signed informed consent Exclusion Criteria: * Diagnosed with any chronic medical condition that can interfere with the study outcome (e.g., cardiovascular disease, cancer, diabetes mellitus type 1 or 2, liver disease, pulmonary disease, renal disease, inflammatory bowel disease, thyroid disease, long COVID, PASC) * Bleeding disorder (e.g., Hemophilia A/B, Von Willebrand Disease, or low platelets), current anemia or current use of blood thinners or anticoagulants (e.g. warfarin, heparin) * Any acute or chronic infection disease or fever in the past month * Antibiotic use in the past 2 months * Use of any prescribed medications (incl. GLP-1 agonists), except for contraceptives * Usage of recreational drugs in the last three months * Unstable body weight (weight gain or loss \>5% of total BW in the past three months) * Following any restrictive diet within one month of starting the study (for example a ketogenic diet or weight loss diet) * Fasted for 16 hours or longer in the past week * History of an eating disorder (e.g., anorexia nervosa, bulimia nervosa, or binge eating disorder) * Allergic to one or more components of the standardized meal and/or shake (i.e., milk, wheat, and soy) * Average alcohol intake that exceeds 1 consumption/day or 7 consumptions/week over the past month * Tobacco smoker or regular use of nicotine products * Donated or intend to donate blood from 2 months before the study until the end of the study * Being pregnant or lactating * Participation in another biomedical study during this study

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Conditions

The condition(s) this trial relates to.

Fasting

As listed by the trial registrant

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

Fasting

Contacts and locations

Locations

  • Human Metabolic Research Unit, Division of Nutritional Sciences. Cornell University

    Ithaca, New York, 14853, United States

More trials for these conditions

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