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Can timing your carbs tame metabolic risk?

NCT ID NCT06684834

Disease control Sponsor: University of Bath 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 12, 2026 · Last updated Aug 13, 2026 · Updated 1 time

Summary

This study tests whether restricting carbohydrates on two consecutive days per week or after 4pm each day can improve metabolic health and energy balance in adults with abdominal overweight or obesity. Over four weeks, participants follow one of these eating patterns or their usual diet, with monitoring of diet, activity, and glucose via wearables. Researchers will measure changes in blood fats, body composition, and other markers to see if these intermittent carb-restriction strategies could help reduce the risk of conditions like type 2 diabetes and heart disease.

What this could mean

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

Active substance
Intermittent carbohydrate restriction (two schedules: 5:2 and early time-restricted)
What this could lead to
If effective, these eating patterns could offer simple, flexible ways to reduce metabolic risk and support weight management in people with excess abdominal fat.
What could go wrong
The trial is small (40 participants) and short-term, so results may not apply broadly. Adherence to strict carb limits can be challenging, and effects may not persist after the intervention ends.

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

40 people

The number who actually took part.

Started

Sep 2023

Finished

Oct 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

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: 1. Waist circumference of ≥94 cm (37 inches) if male and ≥80 cm (31.5 inches) if female, or BMI above 25 kg/m2 2. Fat mass index (FMI) of \>6 kg/m2 for males, and \>9 kg/m2 for females 3. Aged between 18-65 years 4. Has maintained a stable weight in the last three months (\<3% change in body mass) 5. Keeps track of menstrual cycle regularity or oral contraceptive use (females only) Exclusion Criteria: 1. Has a body weight of ≥120kg 2. Plans to undertake other lifestyle modifications during the study to manage weight (e.g. changes in dietary intake or activity levels) 3. Current or previous eating disorder 4. Diagnosed with major chronic conditions (e.g. type 2 diabetes, coronary heart disease, cancer, chronic kidney disease, etc.) 5. Use of medication that may interfere with study outcomes (e.g. glucose or lipid lowering medications) 6. Currently or recently pregnant (within last 6 months), planning to get pregnant or currently lactating 7. Has donated more than 500ml of blood in the last 3 months prior to the initial laboratory visit 8. Insufficient mental capacity or language skills to independently understand and follow the study protocol 9. Dietary restrictions to ingredients in test meals (e.g. gluten and lactose) 10. Has an irregular sleeping pattern (e.g. due to undertaking night-shift work) 11. Any condition, concurrent intervention or behaviour deemed either to pose undue personal risk to the participant or to introduce bias into the experiment

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Conditions

The condition(s) this trial relates to.

Obesity obesity disorder Overweight

As listed by the trial registrant

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

Obesity and overweight

Contacts and locations

Locations

  • University of Bath

    Bath, Somerset, BA2 7AY, United Kingdom

More trials for these conditions

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