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Study of grape consumption in adaptation to seasonal photoperiod

NCT ID NCT07886788

NEW Sponsor: University Rovira i Virgili Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
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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.
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Paused for now. It may or may not start again.
Ongoing This study
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The trial has finished. Results may not be published yet.
Stopped early
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Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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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
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Status unknown
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First seen Oct 21, 2026 · Last updated Oct 21, 2026

Summary

The goal of this randomized clinical trial is to learn whether consuming grapes during their natural season can help the body adapt to the shorter daylight hours of winter. The study includes men and women aged 30-70 years with either normal weight or overweight or obesity and metabolic dysfunction-associated steatotic liver disease (MASLD). The main questions it aims to answer are: * Does seasonal grape consumption change circulating microRNAs, small molecules involved in regulating gene activity? * Does grape consumption influence sleep, physical activity, metabolic markers, body composition, muscle function, and gut bacteria during the transition to winter? Within each population group, researchers will compare participants consuming yogurt with freeze-dried grape powder with participants consuming the same yogurt without grape powder. Both groups will receive the same Mediterranean-style dietary guidance. Participants will: * Consume two yogurts daily for 3 weeks, either with or without a total daily dose of 16 grams of freeze-dried grape powder, equivalent to approximately 80 grams of fresh grapes. * Complete a further 2 weeks of follow-up without the grape intervention. * Attend an initial information visit and three assessment visits for blood sampling, stool sample collection, and measurements of body composition and muscle function. * Wear a wrist device to monitor sleep and physical activity. * Complete questionnaires, dietary records, and a sleep diary.

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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

46 people

The number who actually took part.

Started

Sep 2026

Expected to finish

Nov 2026

An estimate. End dates often move.

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

30 to 70 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: * Men and women aged 30-70 years. * Body mass index (BMI) between 18.5 and 39.9 kg/m². * Written informed consent. * Membership in one of the following population groups: * Normal-weight group: BMI between 18.5 and 24.9 kg/m². * Overweight or obesity group: BMI between 25.0 and 39.9 kg/m² and a diagnosis of metabolic dysfunction-associated steatotic liver disease (MASLD). Exclusion Criteria: * Alcohol consumption exceeding 10 g/day or use of other toxic substances. * Acute or chronic liver disease of an etiology other than MASLD. * Active inflammatory, infectious, or neoplastic disease. * Pregnancy. * Women receiving hormonal contraceptive treatment. * Antibiotic treatment within the 4 weeks before enrollment. * Chronic treatment with corticosteroids and/or nonsteroidal anti-inflammatory drugs (NSAIDs). * Milk protein allergy. * Grape-related food intolerances.

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Conditions

The condition(s) this trial relates to.

metabolic dysfunction-associated steatotic liver disease Obesity obesity disorder Overweight

As listed by the trial registrant

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

Metabolic dysfunction-associated steatotic liver disease Obesity / overweight Overweight

Contacts and locations

Locations

  • Hospital Universitari Joan XXIII - Unitat d'Investigació Clínica, IRB CatSud

    Tarragona, Tarragona, 43005, Spain

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