---
title: Reliability of a Food Frequency Questionnaire in the Assessment of Dietary Intake Including FODMAPs in Different Populations, and Relationship With IBS Symptoms and the Degree of Self-assessed Physical Activity
nct_id: NCT05293769
overall_status: RECRUITING
sponsor: Universitair Ziekenhuis Brussel
study_type: OBSERVATIONAL
primary_condition: Irritable Bowel Syndrome
countries: Belgium
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT05293769.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT05293769"
ct_last_update_post_date: 2025-12-18
last_seen_at: "2026-05-12T07:05:36.385Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Reliability of a Food Frequency Questionnaire in the Assessment of Dietary Intake Including FODMAPs in Different Populations, and Relationship With IBS Symptoms and the Degree of Self-assessed Physical Activity

**Official Title:** Reliability of a Food Frequency Questionnaire in the Assessment of Dietary Intake Including FODMAPs (Fermentable Oligosaccharides, Disaccharides, Monosaccharides and Polyols) in Different Populations, and Relationship With IBS (Inflammatory Bowel Syndrome) Symptoms and the Degree of Self-assessed Physical Activity

**NCT ID:** [NCT05293769](https://clinicaltrials.gov/study/NCT05293769)

## Key Facts

- **Status:** RECRUITING
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 400
- **Lead Sponsor:** Universitair Ziekenhuis Brussel
- **Conditions:** Irritable Bowel Syndrome
- **Start Date:** 2022-10-15
- **Completion Date:** 2030-12-31
- **CT.gov Last Update:** 2025-12-18

## Brief Summary

During an online assessment participants will fill in questionnaires evaluating demographic data, psychological variables, the degree of self-assessed physical activity and symptoms of irritable bowel. Dietary intake will be assessed by a newly developed food frequency questionnaire (FFQ) and a 4 days food diary. In order to validate the FFQ in different populations, participants will be recruited from university students, staff of UZ Brussel and VUB, and from the community by advertisement (including social media). IBS patients will be recruited from the gastro-enterology outpatient clinic.

## Eligibility

- **Minimum age:** 18 Years
- **Maximum age:** 65 Years
- **Sex:** ALL

```
Inclusion Criteria:

* 18 - 65 years;
* Provide written informed consent;
* Living in Belgium

Exclusion Criteria:

* Diet \< 8 weeks prior to participation;
* Known or suspected eating disorder;
* Major psychiatric disorder;
* Known gastro-intestinal disease (IBS is allowed);
* Any malignancy in the past 3 years (basocellular carcinoma is allowed);
* Chemotherapy in the past 6 months;
* Infectious gastro-enteritis in the past 6 months (infectious gastro-enteritis defined as the concurrent presence of one of the following signs during 2 or more consecutive days: fever, vomiting, sudden onset of diarrhea, hospitalization because of these symptoms);
* Previous abdominal surgery (appendectomy and cholecystectomy are allowed);
* Alcohol abuse defined as \> 14 U per week;
* Use of illicit drugs;
* Intake of drugs with known major gastro-intestinal side effects.
* Initiation of neuromodulators less than 3 months before participation. Neuromodulators are allowed when taken at a stable dose for at least 3 months;
* Pregnancy.
```

## Arms

- **IBS - arm**
- **healthy - arm**

## Interventions

- **questionnaire** (OTHER) — questionnaire will be filled in by all participants

## Primary Outcomes

- **To validate the newly developed food frequency questionnaire against the standard 4-day food diary across different populations** _(time frame: 2 years)_

## Secondary Outcomes

- **Comparison of dietary and FODMAP intake in IBS vs. non-IBS patients in different populations** _(time frame: 2 years)_
- **Comparison of the degree of physical activity in IBS vs. non-IBS patients in different populations** _(time frame: 2 years)_
- **Comparison of the degree of physical activity and IBS symptom severity in different populations** _(time frame: 2 years)_

## Locations (1)

- UZ Brussel, Jette, Brussels Capital, Belgium — _RECRUITING_

## Recent Field Changes (last 30 days)

- `outcomes.primary` — added _(2026-05-12)_
- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.secondary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.uz brussel|jette|brussels capital|belgium` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT05293769.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT05293769*  
*This page is a raw mirror with no AI summary, no editorial enrichment, and no Parkinson's-specific filtering.*