Effects of Low FODMAP Diet on Leaky Gut

Effects of Low FODMAP Diet on Leaky Gut and Mucosal Immune Cell Abundance in Diarrhea-predominant Irritable Bowel Syndrome

The pathophysiology of Irritable bowel syndrome (IBS) is multifactorial involving complex interplay of altered intestinal permeability, mucosal immune activation, visceral hypersensitivity and gut dysbiosis. Although the exact triggers for these pathological changes in IBS are not clear but diet might play an important role. In fact, several studies have reported improvement in gastrointestinal symptoms on a diet low in FODMAPs (LFD) in patients with IBS, specifically in diarrhea predominant IBS (IBS-D). However, the mechanism of action of LFD is not well understood.

Study Overview

• Status: Completed
• Conditions: Irritable Bowel Syndrome
• Intervention / Treatment: Other: FODMAP diet

Detailed Description

we aim to evaluate the following in patients with IBS-D. The effect of LFD on colonic permeability. 2.The effect of LFD on abundance of colonic mucosal immune cells specifically T-cell and mast cell abundance 3.The effect of LFD on colonic mucosal microbiome

• Study Type: Interventional
• Enrollment (Actual): 14
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • Massachusetts
    • Boston, Massachusetts, United States, 02215
      • Beth Israel Deaconess Medical Center
  • Michigan
    • Ann Arbor, Michigan, United States, 48109
      • University of Michigan

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 65 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• aged 18-65 years at the time of screening
• normal serum studies including serum tissue-transglutaminase antibodies, thyroid stimulating hormone levels, C-reactive protein, complete blood count since the onset of symptoms
• normal stool studies including C diff testing, culture, ova and parasites since the onset of symptoms
• IBS-SSS score of ≥175 at the end of 7-day screening period

Exclusion criteria:

• individuals already on a LFD or other dietary restriction such as gluten free diet within the past 6 months
• individuals with any known food allergy or insulin-dependent diabetes
• known history of celiac disease, inflammatory bowel disease or microscopic colitis
• prior small bowel or colonic surgery or cholecystectomy
• pregnant patients
• antibiotics in the past 3 months
• those who regularly use mast cell stabilizers or anti-histaminic or non-steroidal anti-inflammatory agents (NSAIDs) excluding daily baby aspirin or steroids or bile-acid binder.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Basic Science
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: FODMAP diet	Other: FODMAP diet; low FODMAP diet

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
colonic permeability	Lactulose:Mannitol ratio pre and post treatment	4 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
colonic immune cells	expression of tight junction proteins pre and post treatment using RT-PCR	4 weeks
colonic microbiome	relative stool microbial abundance pre and post treatment measured using 16s RNA	4 weeks

Collaborators and Investigators

• Sponsor: Beth Israel Deaconess Medical Center
• Collaborators: University of Michigan
• Investigators: Principal Investigator: Judy Nee, MD, Beth Israel Deaconess Medical Center

Study record dates

Study Major Dates

• Study Start (Actual): May 20, 2019
• Primary Completion (Actual): June 1, 2021
• Study Completion (Actual): June 1, 2021

Study Registration Dates

• First Submitted: August 5, 2020
• First Submitted That Met QC Criteria: August 24, 2020
• First Posted (Actual): August 26, 2020

Study Record Updates

• Last Update Posted (Actual): May 23, 2025
• Last Update Submitted That Met QC Criteria: May 20, 2025
• Last Verified: May 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Intestinal Diseases; Disease; Digestive System Diseases; Gastrointestinal Diseases; Colonic Diseases; Colonic Diseases, Functional; Irritable Bowel Syndrome; Syndrome
• Other Study ID Numbers: 2019P000149

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No