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Inulin

Overview

Inulin is the longer-chain member of the inulin-type fructans, linear fructose polymers with a degree of polymerisation often described around 10–60. Oligofructose is the short-chain mixture, about 2–8 or, in another convention, up to 10. Oligofructose-enriched inulin is a blend of the two. The names are not interchangeable [1,2].

In mice fed a Western diet, oligofructose-enriched inulin prevented the increase in inner-colonic mucus penetrability. Mucus growth was not restored [3]. The microbial effector was not isolated, and combining the fibre with Bifidobacterium longum NCC2705 did not preserve the penetrability effect [3]. That is a defined mouse exposure of the enriched mixture. It is not an indispensable nutrient, not a human dose, and not a result for inulin alone or for oligofructose alone [1,3].

Dietary Origin

Chicory and some other plants store inulin-type fructans across a range of chain lengths. A food that contains mixed fructans does not, by that fact, contain a standardised long-chain inulin ingredient or the enriched blend used in the mouse diet [1]. Commercial oligofructose is usually a partial hydrolysate of chicory inulin and is a different preparation [1,2]. No food page here has a chain-length measurement that would support a contains relationship for inulin.

Research Spotlights & Evidence Checks

🔎 Evidence Check · isolated-substance

Does the mouse mucus result belong to inulin alone?

No. The preparation was oligofructose-enriched inulin. Mucus growth was not restored, and adding a named Bifidobacterium strain did not preserve the penetrability effect [3].

Read the evidence

The mouse study prevented increased inner-colonic mucus penetrability on a Western diet [3]. The material was the enriched blend, which Roberfroid separates from both longer-chain inulin and short-chain oligofructose [1]. The result cannot be reassigned to either fraction alone, or to a serving of chicory, onion, or garlic [1,3].

Recipes

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Foods

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Biological Regulatory Systems

Biological Regulatory System	Evidence-qualified relationship	Evidence
Gut-Brain Axis & Enteric Nervous System (BRS5)	Oligofructose-enriched inulin, not inulin alone, is the exposure mapped to keystone taxa support. It prevented a Western-diet increase in mouse colonic mucus penetrability and did not restore mucus growth.	[1,3]

References

[1] Roberfroid (2007). Inulin-type fructans: functional food ingredients. Separates longer-chain inulin, short-chain oligofructose, and oligofructose-enriched inulin. The mouse result below used the enriched blend.

[2] Niness (1999). Inulin and oligofructose: what are they?. Describes oligofructose as the short-chain subgroup of inulin, with an upper bound of 10 rather than 8, so the cutoff is a convention.

[3] Schroeder et al. (2018). Bifidobacteria or Fiber Protects against Diet-Induced Microbiota-Mediated Colonic Mucus Deterioration. In Western-diet mice, oligofructose-enriched inulin prevented increased inner-colonic mucus penetrability. Mucus growth was not restored, and combining it with B. longum NCC2705 did not preserve the penetrability effect.