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Pistachios before bed: a natural sleep aid?

NCT ID NCT07651605

Knowledge-focused Sponsor: Universidad Autonoma de Queretaro Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether eating 28 grams of pistachios (about 40 nuts) one hour before bedtime could help regulate the body's internal clock in 28 overweight young adults. Researchers measured melatonin levels, antioxidant activity, and sleep-wake patterns. The goal was to see if natural compounds in pistachios, like phyto-melatonin, can influence circadian rhythms.

What this could mean

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

Active substance
pistachios (28 g daily, 1 hour before bedtime)
What this could lead to
If successful, this could suggest that eating pistachios before bed may help regulate the body's internal clock and improve sleep patterns.
What could go wrong
This is a small, completed study with only 28 participants, so results may not apply to everyone. The effect of pistachios on circadian rhythm is still uncertain and needs larger trials.

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

28 people

The number who actually took part.

Started

Sep 2021

Finished

Nov 2021

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 45 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: * No diagnosed diseases * Not regularly taking medications that affect melatonin synthesis or body regulation. Exclusion Criteria: * Smokers * Pregnant women * Individuals with night shifts, those following special diets or taking weight loss supplements * People who had undergone recent surgical procedures or significant weight loss in two months before the study. * Those taking sleep medications. * Individuals who had made trans meridian trips within 1 month of the evaluation, * Individuals with allergies, intolerances, or aversions to nuts/pistachios * Participants who voluntarily withdrew from the study * Participants who tested positive for COVID-19 during the intervention * Participants who experienced adverse effects.

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Conditions

The condition(s) this trial relates to.

circadian rhythm sleep disorder

As listed by the trial registrant

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

Circadian rhythm

Contacts and locations

Locations

  • Universidad Autónoma de Querétaro

    Querétaro City, Querétaro, 76000, Mexico

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