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EFFECT OF A DİETİTİAN-SUPERVİSED LOW-FODMAP DİET VERSUS STANDARD WRİTTEN ADVİCE ON GASTROİNTESTİNAL SYMPTOMS AND INFLAMMATORY BİOMARKERS İN IRRİTABLE BOWEL SYNDROME: A RANDOMİZED CONTROLLED TRİAL

26 maggio 2026 aggiornato da: Sevde Kahraman, Biruni University

Background:

Irritable Bowel Syndrome (IBS) is the most prevalent functional gastrointestinal (GI) pathology among GI disorders. Various dietary interventions, particularly the low-FODMAP diet, are employed to alleviate IBS symptoms.

Study Population & Design:

This study will include 78 adult patients, aged 18-65, diagnosed with IBS according to Rome IV criteria at the Biruni University Faculty of Medicine Hospital Gastroenterology Outpatient Clinic. Participants will be divided into two parallel groups:

Group 1 (n=39): Will receive dietary intervention solely through physician follow-up (provided with a standard hospital brochure listing prohibited foods).

Group 2 (n=39): Will receive structured, personalized dietary intervention through individualized nutritional counseling by a dietitian.

Duration: The low-FODMAP diet intervention for both groups will last for 8 weeks.

Outcome Measures:

At baseline (week 0) and at the conclusion of the study (week 8), the following assessments will be conducted:

Clinical Scores: IBS Symptom Severity Score (IBS-SSS) and the 15-item Gastrointestinal Symptom Rating Scale (GSRS).

Biomarkers: Hs-CRP and fecal calprotectin levels analyzed from blood and stool samples.

Objective:

The primary objective is to determine the impact of individualized nutritional counseling on GI symptoms and inflammatory biomarkers (hs-CRP, fecal calprotectin) during a low-FODMAP diet. Secondary objectives include evaluating the significance of the dietitian's role and observing how lifestyle factors (sleep and physical activity) influence symptom outcomes alongside nutritional therapy.

Panoramica dello studio

Stato

Completato

Condizioni

Intervento / Trattamento

Descrizione dettagliata

The low-FODMAP diet, developed for the treatment of IBS, is defined as a dietary regimen that restricts fermentable oligosaccharides, disaccharides, monosaccharides, and polyols-which are short-chain carbohydrates with limited or poor absorption.

Study Timeline and Interventions:

First Week: A 31-item "Data Collection Form" covering socio-demographic characteristics, health information, and nutritional habits will be administered.

Daily Monitoring: Daily records of the "Bristol Stool Scale" (BSS) will be maintained throughout the study.

Study Duration: The low-FODMAP diet intervention will be implemented for a total duration of 8 weeks.

Face-to-Face Assessments (Conducted at Baseline and Conclusion):

At the beginning and end of the study, the following assessments will be conducted face-to-face with the participants:

  • 24-hour Dietary Recall
  • Anthropometric measurements
  • Frequency of FODMAP-sourced food consumption over the past month
  • 7-item "International Physical Activity Questionnaire - Short Form" (IPAQ-SF)
  • 5-item "IBS Symptom Severity Score" (IBS-SSS)
  • 15-item "Gastrointestinal Symptom Rating Scale" (GSRS)
  • 8-item "Epworth Sleepiness Scale" (ESS)

Laboratory Analysis:

Hs-CRP and fecal calprotectin levels will be analyzed from blood and stool samples collected at baseline and at the conclusion of the study.

Tipo di studio

Interventistico

Iscrizione (Effettivo)

50

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Luoghi di studio

  • Turchia (Türkiye)
    • Istanbul
      • Istanbul, Istanbul, Turchia (Türkiye)
        • Biruni University Faculty of Medicine Hospital
      • Istanbul, Istanbul, Turchia (Türkiye)
        • Biruni University

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto
  • Adulto più anziano

Accetta volontari sani

No

Descrizione

Inclusion Criteria:

  • Adults aged 18-65 years.
  • Diagnosed with IBS according to the Rome IV criteria.

Exclusion Criteria:

  • Use of antibiotics, NSAIDs, oral contraceptives, or hormone therapy during the study.
  • Pregnancy or breastfeeding.
  • Diagnosis of celiac disease

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Dietitian group
A dietitian planned the low FODMAP diet for the first group (n=31) through individual dietary counselling.
Comportamentale: Low-FODMAP Diet Intervention

This intervention consists of an 8-week low-FODMAP dietary regimen aimed at restricting the intake of short-chain carbohydrates, including fermentable oligosaccharides, disaccharides, monosaccharides, and polyols.

The intervention is administered through two distinct protocols to compare delivery methods: one group receives standard hospital care consisting of a brief physician follow-up accompanied by a standard educational brochure listing prohibited foods, while the other group receives structured, individualized nutritional counseling and personalized meal planning led by a professional dietitian.
Comparatore attivo: Doctor group
The second group (n=19) was given a brochure on the low FODMAP diet, as is routine in the hospital, listing foods prohibited by the gastroenterologist.
Comportamentale: Low-FODMAP Diet Intervention

This intervention consists of an 8-week low-FODMAP dietary regimen aimed at restricting the intake of short-chain carbohydrates, including fermentable oligosaccharides, disaccharides, monosaccharides, and polyols.

The intervention is administered through two distinct protocols to compare delivery methods: one group receives standard hospital care consisting of a brief physician follow-up accompanied by a standard educational brochure listing prohibited foods, while the other group receives structured, individualized nutritional counseling and personalized meal planning led by a professional dietitian.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
IBS-SSS
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
Irritable Bowel Syndrome Symptom Severity Score (IBS-SSS). The IBS-SSS consists of 5 questions, each scored from 0 to 100, with a maximum possible total score of 500. It determines the severity of abdominal pain, abdominal pain frequency, abdominal bloating severity, satisfaction with bowel habits, and the impact of the disease on quality of life. Total scores are classified as follows: 75-174 points = mild IBS, 175-299 points = moderate IBS, and greater than or equal to 300 points = severe IBS. Higher scores indicate more severe IBS symptoms.
From enrollment to the end of treatment at 8 weeks
GSRS
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
Gastrointestinal Symptom Rating Scale (GSRS). The GSRS is a 15-item questionnaire that uses a 5-point Likert scale to assess the severity of gastrointestinal symptoms across 5 subscales: abdominal pain, reflux, diarrhoea, indigestion, and constipation. Scores are aggregated to determine symptom severity, where higher scores represent a higher severity of gastrointestinal symptoms.
From enrollment to the end of treatment at 8 weeks
Fecal Calprotectin
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
Fecal calprotectin levels will be analyzed from stool samples collected from participants to evaluate gastrointestinal inflammation.
From enrollment to the end of treatment at 8 weeks
Hs-CRP
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
High-Sensitivity C-Reactive Protein (hs-CRP). Hs-CRP levels will be analyzed from blood samples collected from individuals to monitor systemic biochemical findings of inflammation.
From enrollment to the end of treatment at 8 weeks

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Anthropometric measurement data
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
height in cm, body weight in kg, waist circumference in cm, hip circumference in cm, body composition and bioelectrical impedance analysis (BIA) measurements
From enrollment to the end of treatment at 8 weeks
IPAQ-SF
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
The IPAQ-SF is a seven-item measure that assesses individuals' physical activity levels over the past seven days. The scale inquires about walking, moderate and vigorous physical activities, and time spent sitting, and physical activity level is calculated in MET-minutes per week
From enrollment to the end of treatment at 8 weeks
Epworth Sleepiness Scale (ESS)
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
The ESS is an eight-item self-report measure that assesses an individual's likelihood of falling asleep in various everyday situations
From enrollment to the end of treatment at 8 weeks
Data Collection Form
Lasso di tempo: At the beginning of the study
At the beginning of the study, a 31-item Data Collection Form; covering the sociodemographic characteristics, health information and dietary habits of participating patients was administered.
At the beginning of the study
Daily Total FODMAP Intake
Lasso di tempo: From enrollment to the end of treatment at 8 weeks
Food consumption records were taken for 3 days before and after the diet. The data was entered into the Bebis program. Food consumption records were calculated using the Nutrition Information System (BeBiS, version 9, Germany) for energy, macronutrients, micronutrients and FODMAP amounts (total FODMAP (g) = lactose (g) + oligosaccharides (g) + mannitol (g) + sorbitol (g)). Free fructose, a monosaccharide, could not be included in this programme as it could not be calculated.
From enrollment to the end of treatment at 8 weeks

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Biruni University

Investigatori

  • Cattedra di studio: Sevde KAHRAMAN, Asst. Prof., Biruni University
  • Direttore dello studio: Zeynep Çavdar, Master's student and dietitan, Biruni University
  • Investigatore principale: Koray Koçhan, Specialist of Gastroenterology, Department of Gastroenterology, Biruni University Faculty of Medicine Hospital
  • Investigatore principale: Huri Demirci, PhD, Associate Professor, Biruni University
  • Cattedra di studio: Fatma Çelik, PhD, Professor, Biruni University

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Effettivo)

1 aprile 2025

Completamento primario (Effettivo)

1 ottobre 2025

Completamento dello studio (Effettivo)

30 ottobre 2025

Date di iscrizione allo studio

Primo inviato

26 maggio 2026

Primo inviato che soddisfa i criteri di controllo qualità

26 maggio 2026

Primo Inserito (Effettivo)

2 giugno 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

2 giugno 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

26 maggio 2026

Ultimo verificato

1 maggio 2026

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Termini MeSH pertinenti aggiuntivi

Altri numeri di identificazione dello studio

  • 2015-KAEK-80-23-49/SKLOWFODMAP

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

NO

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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