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Can a 5-Day diet kickstart weight loss and lower blood pressure?

NCT ID NCT05821660

Knowledge-focused Sponsor: Buchinger Wilhelmi Development & Holding GmbH 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looked at how a five-day low-calorie, ketogenic diet program affects body weight and blood pressure in 64 healthy adults. Participants followed the diet remotely using a special kit. The goal was to see if this short-term diet causes measurable changes in metabolism. Since the study is complete and only included healthy people, the results will show whether the diet is safe and effective for this group.

What this could mean

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

Active substance
Five-day hypocaloric and ketogenic programme (Buchinger Wilhelmi Fastingbox)
What this could lead to
If successful, this could show that a short, remotely delivered diet program safely improves weight and blood pressure in healthy people.
What could go wrong
This is a small, completed study in healthy volunteers only, so results may not apply to people with medical conditions. Dietary changes can cause temporary side effects like fatigue or headaches.

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

64 people

The number who actually took part.

Started

Apr 2023

Finished

Aug 2023

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 80 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.

Exclusion Criteria: * Not able to sign the informed consent * diagnosticated with cachexia, anorexia, nervosa, advanced kidney, liver or cerebrovascular insufficiency. * Intake of antibiotics up to 2 months prior the study * Medicated high blood pressure * Diagnosed hyperuricemia * Diagnosed diabetes mellitus type I and II * Diagnosed kidney stone * Active malignant diseases * Known substance addiction * Pregnancy or breastfeeding * Participation in another study

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As listed by the trial registrant

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

Healthy lifestyle Healthy nutrition

Contacts and locations

Locations

  • Buchinger Wilhelmi Clinic

    Überlingen, Baden-Wurttemberg, 88662, Germany

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