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Can olive oil and nuts in early pregnancy ward off gestational diabetes?

NCT ID NCT07817017

Prevention Sponsor: Hospital San Carlos, Madrid Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
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
Running, but no longer taking on new participants.
Completed
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 Results may not be published yet.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)
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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
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Status unknown
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First seen Sep 14, 2026 · Last updated Sep 17, 2026 · Updated 3 times

Summary

Researchers are testing whether an intensive Mediterranean diet program started in the first trimester of pregnancy lowers the chance of developing gestational diabetes in women at high risk. The trial enrolls about 1,200 pregnant women aged 18 to 50 with a single, unassisted pregnancy and normal early blood sugar. Half receive detailed nutrition counseling on olive oil, nuts, vegetables, whole grains, and fish; the other half get standard pregnancy diet advice. The study also collects clinical, body measurement, and genetic data to build a risk score for gestational diabetes.

What this could mean

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

Active substance
a Mediterranean diet program with intensive nutrition counseling
What this could lead to
If it works, an early Mediterranean diet program could become a low-cost way to prevent gestational diabetes in women flagged as high-risk, and genetic risk scoring could help target who needs it most.
What could go wrong
Diet trials often struggle with adherence, and eating patterns are hard to change during pregnancy. The genetic risk score may not predict gestational diabetes well enough to be useful, and results in this group may not apply to all pregnant women.

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 1,200 people

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

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Dec 2028

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 50 years

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * Unassisted single pregnancy; * Age between 18 and 50 years old; * Fasting blood glucose \<92 mg/dl in the first gestational blood test; * First trimester ultrasound before the 12th gestational week. Exclusion Criteria: * Multiple or assisted pregnancies; * Any pregestational illness or pregestational treatment that may affect pregnancy; * Known intolerance/allergy to any component of the nutritional intervention.

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Conditions

The condition(s) this trial relates to.

gestational diabetes

As listed by the trial registrant

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

Gestational diabetes mellitus (GDM) Mediterranean diet Pregnancy

How to take part

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  1. The places running it

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  2. The official record

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  3. A doctor treating you

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Contacts and locations

Locations

  • Hospital Clínico San Carlos

    Madrid, Madrid, 28040, Spain

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