Inulin (Chicory Root Fiber)

Last reviewed October 19, 2026

In plain words: Inulin is a fiber from chicory root added to many "high-fiber" foods. It is fermented by gut bacteria.

What the evidence review says

Inulin is a fiber from chicory root added to many 'high-fiber' foods. It is fermented by gut bacteria, so larger amounts are linked with gas and bloating, especially for people sensitive to FODMAPs. This is a comfort issue, not a cancer or safety-ban finding.

Fermentation causes gas and bloating, especially if the dose jumps or the chains are short. In healthy young adults, native inulin up to 10 g/day and oligofructose up to 5 g/day were tolerated; 10 g oligofructose clearly raised symptoms, mostly flatulence then bloating. It is a fructan, so people who limit FODMAPs often react. That is a tolerance issue, not a carcinogenicity or ban finding. At 12 g/day, EFSA accepted that native chicory inulin increases stool frequency. A 2022 meta-analysis of 50 trials found a bifidogenic effect at 3-20 g/day in healthy people and in several non-GI patient groups, but not in gastrointestinal disorders.

• Source: Bonnema AL et al., J Am Diet Assoc, 2010 · doi:10.1016/j.jada.2010.03.025

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This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.