Summary: In a 12-week randomised trial in people with obesity at risk of type 2 diabetes, an intrinsic chicory-root fibre product significantly improved whole-body insulin sensitivity and lowered triglycerides, with peripheral insulin sensitivity and liver fat showing favourable trends, alongside enrichment of butyrate-producing gut bacteria.
PICO Summary
| Element | Detail |
|---|---|
| Population | Adults with obesity at risk for type 2 diabetes; Netherlands. |
| Intervention | Daily intrinsic chicory-root fibre (whole plant-cell preparation) for 12 weeks. |
| Comparison | Placebo. |
| Outcome | Whole-body insulin sensitivity improved (p=0.032) and triglycerides fell (p=0.049); peripheral insulin sensitivity (p=0.085) and intrahepatic lipid (p=0.063) showed favourable trends, with more small adipocytes (p=0.008). Gains coincided with increased fibre-degrading Bifidobacterium and butyrate-producing Anaerostipes and a shift toward a butyrogenic pathway. |
Chicory-root fibre and insulin sensitivity
RCT · obesity at risk of T2D · 12 weeks
Chicory-root fibre significantly improved whole-body insulin sensitivity and lowered triglycerides over 12 weeks, with peripheral insulin sensitivity and liver fat showing non-significant favourable trends. Effects were modest and need replication.
Expert Commentary
This is a mechanistically rich study that links a dietary fibre to a plausible biological chain: feeding butyrate-producing colonic bacteria, shifting the microbial community, and improving insulin sensitivity, with the increase in small adipocytes hinting at healthier fat-tissue remodelling. I like that the authors are precise about their statistics rather than overselling, and so should this summary be: the headline whole-body insulin sensitivity improvement and the triglyceride fall reached significance, while the peripheral insulin sensitivity and liver-fat changes were only trends, not significant. That distinction matters and is easy to blur. The study is also relatively small and the metabolic effects, though coherent, are modest, the kind of signal that needs replication and longer follow-up before being called a clinical intervention. Can I use this with my patients? Yes, in a low-key, dietary way. It adds mechanistic weight to advice I already give, that increasing fermentable plant fibre is good for metabolic health, and chicory-derived inulin-type fibres are a reasonable, food-based way to do that, with a caution that they commonly cause bloating and gas. I would frame it as supporting a fibre-rich diet, not as a proven insulin-sensitising therapy.
References
Omary L, Canfora EE, Puhlmann ML, et al. Intrinsic chicory root fibers modulate colonic microbial butyrate-producing pathways and improve insulin sensitivity in individuals with obesity. Cell Rep Med. 2025;6(7):102237. doi:10.1016/j.xcrm.2025.102237