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Effect of an Early and Intensified Nutritional Intervention on the Risk of Developing Gestational Diabetes Mellitus (MedDiet in GDM)

12 september 2026 bijgewerkt door: Ana M. Ramos-Leví, Hospital San Carlos, Madrid

Effect of an Early and Intensified Nutritional Intervention Based on a Mediterranean Diet (MedDiet) in Women With Clinical-genetic Risk of Developing Gestational Diabetes Mellitus (GDM): a Randomized, Parallel, Interventional, Controlled Clinical Trial

The goal of this clinical trial is to learn if a nutritional intervention based on a Mediterranean diet (MedDiet), initiated early in pregnancy, reduces the incidence of gestational diabetes mellitus (GDM) and other adverse maternal, fetal and obstetric events in pregnant women considered high-risk. It will also learn about the stratification of GDM risk based on clinical, anthropometric, analytical and genetic characteristics.

The main questions it aims to answer are:

  • Does the nutritional intervention based on MedDiet reduce the incidence of GDM in women with high risk?
  • How can we stratify the risk of GDM? Researchers will compare an advanced nutritional intervention based on a Mediterranean diet to standard care (general recommendations given at the beginning of pregnancy).

Participants will:

  • Receive intensive nutritional counselling or standard regular recommendations during the first trimester of pregnancy.
  • Visit the clinic at the time of the first ultrasound (gestational week 8-11) and at the time of screening for GDM (gestational week 24-26).
  • Undergo a genetic test performed with a buccal swab.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Studietype

Ingrijpend

Inschrijving (Geschat)

1200

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Locaties

  • Spanje
    • Madrid
      • Madrid, Madrid, Spanje, 28040
        • Hospital Clinico San Carlos
        • Contact:

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Volwassen

Accepteert gezonde vrijwilligers

Nee

Beschrijving

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.

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Preventie
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Verdrievoudigen

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Geen tussenkomst: Standard treatment
The nutritional intervention will consist of providing information on healthy lifestyle measures through an 8-minute informational video (accessible via QR code at the consultation room or the permanent link https://www.youtube.com/watch?v=Qgcz5t9B9WI). Routine obstetric follow-up does not involve subsequent monitoring of adherence to these recommendations, beyond the usual follow-up.
Experimenteel: Advanced treatment
A specific nutritional intervention consisting of a group session that will last approximately one hour, led by a nutritionist from the research team. This session will explain in detail the key aspects of the MedDiet: consumption of >40 ml/day of extra virgin olive oil, 30 g of nuts per day, 3-4 pieces of whole fruit (not juice), homemade stir-fries, 2-3 servings of vegetables and/or salads per day, 2-3 servings per day of low-fat dairy products, whole grains, 2-3 servings of legumes per week, consumption of fish, limiting the consumption of red meat, and avoiding ultra-processed products, sliced bread, soft drinks, juices, fast food, and pre-cooked products. Two telephonic interviews will be scheduled for follow-up around gestational weeks 16 and 20 to provide motivation and assess and reinforce adherence to these recommendations.
Ander: Nutritional intervention based on a Mediterranean diet
The nutritional intervention consists of a 1-hour group session led by a nutritionist from the research team. Includes a detailed description of the key aspects of the MedDiet: consumption of >40 ml/day of extra virgin olive oil, 30 g of nuts per day, 3-4 pieces of whole fruit (not juice), homemade stir-fries, 2-3 servings of vegetables and/or salads per day, 2-3 servings per day of low-fat dairy products, whole grains, 2-3 servings of legumes per week, consumption of fish, limiting the consumption of red meat, and avoiding ultra-processed products, sliced bread, soft drinks, juices, fast food, and pre-cooked products. In addition, 2 telephonic interviews for follow-up (gestational weeks 16 and 20) to reinforce adherence and emphasize consumption of >40 ml/day of extra virgin olive oil, 30 g of nuts per day, 3-4 pieces of whole fruit (not juice), daily vegetables and daily physical activity.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Incidence of gestational diabetes mellitus
Tijdsspanne: From enrollment (gestational week 8-11) to the time of screening for gestational diabetes mellitus (gestational week 24-26)

The general objective of this study is to determine whether an advanced nutritional intervention based on Mediterranean diet reduces the incidence of gestational diabetes mellitus and other adverse maternal-fetal obstetric and endocrine-metabolic events in pregnant women considered high-risk based on a risk score derived from the interaction between associated genetic polymorphisms, baseline clinical characteristics, and anthropometric characteristics of pregnant women.

The primary outcome is the comparison of the frequency of GDM, according to IADPSG criteria, between the MedDiet intervention group and the standard treatment group in women at high risk according to the calculated risk of developing GDM.
From enrollment (gestational week 8-11) to the time of screening for gestational diabetes mellitus (gestational week 24-26)

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Frequency of maternal complications
Tijdsspanne: From enrollment (gestational week 8-11) to delivery
Frequency of maternal complications between the MedDiet intervention group and the standard treatment group in women at high risk according to the calculated risk of developing GDM. Variables for this outcome include: maternal weight, weight gain; risk score; frequency of maternal complications (hypertension, eclampsia, infections, carbohydrate metabolism disorders - defined as alterations in normal levels of at least one of the following: fasting glucose, HbA1c, C-peptide, insulin, HOMA-IR)
From enrollment (gestational week 8-11) to delivery
Frequency of fetal complications
Tijdsspanne: From enrollment (gestational week 8-11) to delivery and neonatal period
Comparison of the frequency of fetal complications between the MedDiet intervention group and the standard treatment group in high-risk women, based on the calculated risk of developing gestational diabetes mellitus (GDM). Variables for this outcome include: birth weight, hypoglycemia, potassium abnormalities, calcium abnormalities, polycythemia, admission to the neonatal intensive care unit (NICU).
From enrollment (gestational week 8-11) to delivery and neonatal period
Frequency of obstetric complications
Tijdsspanne: From enrollment (gestational week 8-11) to delivery and immediate postpartum
Comparison of the frequency of obstetric complications between the MedDiet intervention group and the standard treatment group in women at high risk of developing GDM. Variables for this outcome include: type of delivery, dystocia, lacerations during delivery, preterm or postterm delivery (gestational week at delivery).
From enrollment (gestational week 8-11) to delivery and immediate postpartum

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Hospital San Carlos, Madrid

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

15 september 2026

Primaire voltooiing (Geschat)

31 oktober 2028

Studie voltooiing (Geschat)

31 december 2028

Studieregistratiedata

Eerst ingediend

8 september 2026

Eerst ingediend dat voldeed aan de QC-criteria

8 september 2026

Eerst geplaatst (Werkelijk)

14 september 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

16 september 2026

Laatste update ingediend die voldeed aan QC-criteria

12 september 2026

Laatst geverifieerd

1 juni 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • PI25_01413
  • 25/902-EC_X (Andere identificatie: Ethics Committee of the Hospital Clinico San Carlos)

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

JA

Beschrijving IPD-plan

The original protocols of the study will be stored in a locked office in the Department of Endocrinology at our Hospital. De-identified data will be saved on a secure electronic database. Specifically, we will use REDCap® (Vanderbilt University) software, which is known to be a secure, browser-based web application (http://project-redcap.org), for data entry and analysis.

All participant data related to the study, including scales and questionnaires, will be completed in paper form, and will then be recorded and uploaded in the REDCap®Electronic Data Collection Record (eCRD).

IPD delen Ondersteunend informatietype

  • LEERPROTOCOOL
  • SAP
  • ICF

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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