Fibre Subtypes and Reduced Risk of Crohn’s Disease

July 7, 2026

Issue 13

Clinical Question

Are specific dietary fibre subtypes associated with reduced risk of Crohn’s disease in individuals at elevated genetic risk?

Editor’s Bottom Line

These data suggest that interactions between dietary fibre and the intestinal microbiome may play an important role in the early pathogenesis of Crohn’s disease in genetically predisposed patients

Reference

Xue M, McShane C, Kim J, et al. β-Glucan and Inulin Estimated Intake Are Associated With Reduced Risk of Crohn’s Disease, Improved Gut Barrier and Systemic Inflammation Markers, and Multi-Omic Signatures in a High-Risk Cohort. Gastroenterology. Epub ahead of print May 28, 2026. https://doi.org/10.1053/j.gastro.2026.05.006.

Synopsis

This prospective study followed 3,314 asymptomatic first-degree relatives (FDRs) of Crohn’s disease (CD) patients enrolled in the Crohn’s and Colitis Canada – Genetic, Environmental, Microbial (GEM) project. Over a median follow-up of 8.5 years, 94 developed CD. This analysis examined habitual intake of five fermentable fibre subtypes; inulin, FOS, β-glucan, pectin and arabinoxylan. Consumption was estimated using validated baseline food frequency questionnaires and integrated with gut microbiome profiling, intestinal permeability (measured by lactulose-to-mannitol ratio [LMR]), serum C-reactive protein (CRP), and Olink proteomic data (446 proteins).

While total fibre intake was not associated with CD risk, higher estimated β-glucan (Hazard Ratio [HR]: 0.70; 95% Confidence Interval [CI], 0.54–0.92; p=0.009) and inulin (HR: 0.68; 95% CI, 0.48–0.96; p=0.028) intake were each associated with an approximately 30% lower risk of CD. Higher consumption of both fibre subtypes was also associated with preserved intestinal permeability (lower LMR), lower serum CRP, lower abundance of the pathobionts (commensal gut microbes that can turn harmful when the microbial balance is disrupted) Ruminococcus torques and Lachnoclostridium, and lower circulating levels of barrier- and inflammation-related proteins previously linked to preclinical CD in this cohort, including OSM, MMP-9, TREM-1, and CRP.

The protective association was modified by baseline microbiome composition. Specifically, higher abundance of Erysipelotrichaceae UCG-003 and Romboutsia enhanced the benefit, while Colidextribacter attenuated it.

Details

Study Design: Prospective cohort study with nested case-control analysis
Funding: Crohn’s and Colitis Canada, Canadian Institutes of Health Research (CIHR), Helmsley Charitable Trust
Allocation: Non-randomized
Setting: Multicenter
Level of Evidence: 2b