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Carbs vs. calories: which diet boosts your Body's fuel flexibility?

NCT ID NCT07429058

Knowledge-focused Sponsor: Technical University of Munich 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 how a low-carb diet or a standard calorie-restricted diet affects metabolic flexibility—the body's ability to switch between using carbs and fat for energy. Thirty healthy adults followed each diet for two weeks. Researchers measured breath ketones, blood sugar, and other markers to compare the effects.

What this could mean

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

Active substance
Low-carbohydrate diet and standard calorie-restricted diet
What this could lead to
If successful, this study could help explain how different diets affect the body's ability to switch between burning carbs and fat for energy.
What could go wrong
This is a small, short-term study in healthy adults, so results may not apply to people with health conditions or long-term diet changes.

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

30 people

The number who actually took part.

Started

Nov 2023

Finished

Apr 2024

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: * Age 18-40 years * Body mass index (BMI) 18.5-27 kg/m² * Regular exercise or vigorous physical activity at least once per week * Willing and able to comply with the dietary intervention and study procedures * For female participants: non-pregnant and using hormonal contraception Exclusion Criteria: * Acute or chronic illness * Metabolic disorders or conditions associated with altered glucose or lipid metabolism (exclusion of pre-diabetes and diabetes via HbA1c measurement) * Use of medications known to interfere with study outcomes * Intolerance or allergy to components of the study diets * Pregnancy or breastfeeding

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As listed by the trial registrant

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

Dietary carbohydrate restriction, energy deficit

Contacts and locations

Locations

  • Technical University of Munich

    München, Bavaria, 80809, Germany