Impaired Fermentation in the Absence of Gut Microbiota Promotes Inulin-Induced Intestinal Inflammation
Background and aims: Inflammatory bowel diseases (IBD) are characterized by altered gut microbiota composition and impaired dietary fiber fermentation, which can complicate symptom management. Although inulin is a well-established prebiotic fiber, it can exacerbate gut inflammation under certain conditions. We hypothesized that impaired microbial fermentation leaves intact inulin in the gut to…
An animal study reveals the importance of gut microbiota in tolerating fermentable fibers, such as inulin, in the context of inflammatory bowel disease (IBD). Researchers used germ-free mice colonized with human fecal microbiota from ulcerative colitis patients or those with fiber intolerance, and compared their responses to those of conventional mice.
In the germ-free mice lacking a specific immune gene, unfermented inulin led to weight loss, diarrhea, and rectal prolapse. This suggests that effective microbial fermentation is crucial for host tolerance to fermentable fibers. Additionally, the composition of the fiber influenced inflammation - beta-fructan fibers, including inulin, induced marked inflammatory responses, while agave-derived inulin did not.
The study concludes that personalized nutrition, tailored to an individual's gut microbiota and immune status, may be necessary when recommending fiber supplementation for those with immune compromise or gut dysbiosis.
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