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Apple-a-Day study reveals gut changes in just 3 days

NCT ID NCT07499960

Knowledge-focused Sponsor: Czech University of Life Sciences Prague 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026

Summary

This study looked at whether eating three apples daily for three days changes the activity of gut bacteria in healthy adults. Fifteen volunteers provided stool samples before and after the apple-eating period. Scientists analyzed the samples to see if short-term fruit fiber intake leads to measurable shifts in gut metabolism.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
apple consumption (dietary fiber from whole apples)
What this could lead to
If successful, this could help scientists understand how simple dietary changes affect gut health and metabolism.
What could go wrong
This is a very small, early pilot study with only 15 people over 3 days. Results may not apply to everyone or show meaningful health effects.

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

15 people

The number who actually took part.

Started

Apr 2023

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 30 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 adults aged 18-30 years * Able and willing to consume apples daily during the intervention period * Willing to provide stool samples before and after the intervention * Not following a specific prescribed diet * Physically able to maintain usual daily activities during the study * Able to provide written informed consent Exclusion Criteria: * Diagnosed gastrointestinal, metabolic, or chronic systemic disease * Use of antibiotics, probiotics, or regular medication affecting digestion in the period prior to enrolment * Known allergy or intolerance to apples or other fruits * Current participation in another dietary or clinical study * Following a medically prescribed or restrictive diet * Pregnancy or breastfeeding

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As listed by the trial registrant

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

Healthy adult participants

Contacts and locations

Locations

  • Czech University of Life Sciences Prague

    Prague, Prague, 16500, Czechia

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