Your dinner could be messing with your sleep: new study investigates

NCT ID NCT07138313

Knowledge-focused Sponsor: Uppsala University Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study from Uppsala University looks at how a low-fat, fiber-rich diet versus a high-fat, Western-style diet affects sleep quality, heart rate, and metabolism. Twenty-four healthy young adults will follow each diet for about a week, then spend two days in the lab for detailed measurements. The goal is to understand how food choices influence our internal body clock and overall health.

What this could mean

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

Active substance: Low-fat diet and high-fat diet
What this could lead to: If successful, this could reveal how different diets affect sleep quality and daily body rhythms, pointing toward dietary recommendations for better sleep and metabolic health.
What could go wrong: This is a small, early-stage study with only 24 healthy participants, so results may not apply to the general population. It is designed to gather knowledge, not to test a treatment.

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

About 24 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2025

Expected to finish

Dec 2027

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

18 to 32 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 18-32 yr * Healthy (self-reported) and not on chronic medication * BMI 18-27 kg/m2 (and waist circumference \<102 cm), and weight stable (less than 5% body weight change in the past 6 months) * Non-smoker and non-nicotine user * Regular sleep-wake pattern, with sleep duration of 7-9.25 hrs per night * Regular exercise habits the last 2 months * Regular daily meal pattern with 3 main meals Exclusion Criteria: * Major or chronic illness, e.g. diabetes, renal disease or inflammatory bowel disease * Current or history of endocrine or metabolic disorders * Psychiatric or neurological disorders (e.g. bipolar disorder, epilepsy) * Frequent gastrointestinal symptoms * Chronic medication * Any sleep disorder (including recent or chronic symptoms of insomnia) * Shift work in the preceding three months or for a long duration * Extreme chronotype or physical activity patterns * Time travel over two time zones in the preceding month * Too much weight gain or weight loss in the preceding 6 months (±5% body weight in past 6 months) * Any issues with or allergies against the provided food items * Recent major dietary changes or adoption of specific dietary regimens * Women who are pregnant, breastfeeding, or planning to become pregnant during the study period. * Use of illicit drugs or substances of abuse

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Conditions

The condition(s) this trial relates to.

circadian rhythm sleep disorder sleep disorder

As listed by the trial registrant

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

Circadian rhythm Diet interventions Sleep

How to take part

Only the study team decides who joins. These are the ways to reach them.

The places running it

1 site. The list below names each one and where it is.
The official record

ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

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A doctor treating you

A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Your dinner could be messing with your sleep: new study investigates

What the study statuses mean