IBD: Crohn’s Disease, Ulcerative Colitis, and Environmental Triggers
Inflammatory bowel disease (IBD), encompassing Crohn’s disease and ulcerative colitis, has increasing incidence in industrialized nations. Environmental triggers including chemical exposures are hypothesized to initiate mucosal immune dysregulation in genetically susceptible individuals.
PFAS and Intestinal Barrier Function
PFAS compounds disrupt intestinal epithelial tight junction proteins—particularly claudin-4 and occludin—increasing intestinal permeability. Enhanced translocation of luminal bacteria and antigens into the submucosa activates innate immune responses that drive chronic mucosal inflammation characteristic of IBD.
Microbiome Composition Changes
PFAS alter gut microbiome diversity in ways consistent with IBD-associated dysbiosis. Reductions in Firmicutes:Bacteroidetes ratios, decreased butyrate-producing Faecalibacterium prausnitzii, and increased pro-inflammatory Proteobacteria are documented in both PFAS-exposed populations and IBD patients.
Clinical Gastroenterology Practice
Gastroenterologists managing IBD in PFAS-affected communities should document water source and dietary PFAS exposure history. Environmental remediation combined with microbiome-supportive interventions may complement standard anti-inflammatory IBD therapies.