---
title: "Prebiotic Inulin Supplementation and Peripheral Insulin…"
description: "Inulin supplementation did not improve peripheral insulin sensitivity in adults at risk for type 2 diabetes."
url: "https://magellanlongevity.com/study/inulin_rct.md"
canonical: "https://magellanlongevity.com/study/inulin_rct.html"
html: "https://magellanlongevity.com/study/inulin_rct.html"
type: "study"
study_key: "inulin_rct"
journal: "Nutrients"
year: 2021
pmid: "34579112"
citations: 1
updated: 2026-09-02
author: "Gabriel Radu, DO"
author_credentials: "Physiatrist (PM&R). NY medical license 275110. NPI 1376861765."
publisher: "Magellan Longevity"
content_format: "markdown"
---

# Prebiotic Inulin Supplementation and Peripheral Insulin Sensitivity in adults at Elevated Risk for Type 2 Diabetes: A Pilot Randomized Controlled Trial

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## Citation

| Field | Value |
| --- | --- |
| Journal | Nutrients |
| Year | 2021 |
| PMID | [34579112](https://pubmed.ncbi.nlm.nih.gov/34579112/) |
| DOI | — |
| Study key | inulin_rct |

## Takeaway

Inulin supplementation did not improve peripheral insulin sensitivity in adults at risk for type 2 diabetes.

## The question

Does inulin supplementation improve glucose metabolism and reduce the risk of type 2 diabetes in adults at elevated risk?

## Hypothesis

The study aimed to determine the efficacy of inulin supplementation to improve glucose metabolism and reduce type 2 diabetes risk.

## Methods

Adults at risk for type 2 diabetes (n=24, BMI: 31.3 ± 2.9 kg/m², age: 54.4 ± 8.3 years) were enrolled in a 6-week controlled feeding trial. Participants consumed either 10 g/day of inulin or 10 g/day of maltodextrin (placebo). Assessments included peripheral insulin sensitivity, fasting glucose, insulin, HOMA-IR, in vivo skeletal muscle substrate preference, copy number, intestinal permeability, and endotoxin concentrations.

## Results

Participant retention was 92%. Fasting insulin concentrations showed a reduction with inulin (Δ-2.9) compared to an increase with placebo (Δ2.3), but this was attenuated after adjusting for baseline differences. HOMA-IR reduction with inulin (Δ-0.40) remained significant after adjusting for baseline values, compared to an increase with placebo (Δ0.27). Gut 16s increased with inulin supplementation (Δ3.1e) and decreased with placebo (Δ-8.9e). Despite these changes, inulin supplementation did not improve peripheral insulin sensitivity.

## Conclusion

Inulin supplementation did not improve peripheral insulin sensitivity in adults at elevated risk for type 2 diabetes, despite some observed changes in fasting insulin, HOMA-IR, and gut 16s. These findings suggest that larger investigations into inulin and insulin sensitivity in this population may not be warranted.

## Limitations

The study was a pilot trial with a small sample size. There was a baseline difference in fasting insulin between the groups.

## Verbatim from the abstract

> Inulin increased gut Bifidobacteria and improved HOMA-IR after adjustment, though it did not significantly improve peripheral insulin sensitivity in this pilot trial.

## Change in Fasting Insulin and HOMA-IR After 6 Weeks

| Measure | Change (Δ) |
| --- | --- |
| Fasting Insulin (Inulin) | -2.9 |
| Fasting Insulin (Placebo) | 2.3 |
| HOMA-IR (Inulin) | -0.4 |
| HOMA-IR (Placebo) | 0.27 |

*Changes in fasting insulin and HOMA-IR after six weeks of inulin or placebo supplementation. Negative values indicate a reduction, positive values indicate an increase.*

## Where this study is used on Magellan

This paper is one of the citations behind the evidence grade on the pages below. Grades are assigned from the published research and are independent of affiliate commissions.

| Compound or device | Evidence grade | Graded pages |
| --- | --- | --- |
| Inulin (Prebiotic Fiber) | Moderate evidence | [Inulin Prebiotic Fiber](https://magellanlongevity.com/p/201.md) |

## Reference

1. **Prebiotic Inulin Supplementation and Peripheral Insulin Sensitivity in adults at Elevated Risk for Type 2 Diabetes: A Pilot Randomized Controlled Trial**
   Nutrients 2021 · [PMID 34579112](https://pubmed.ncbi.nlm.nih.gov/34579112/)

   > Inulin increased gut Bifidobacteria and improved HOMA-IR after adjustment, though it did not significantly improve peripheral insulin sensitivity in this pilot trial.

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## Related on Magellan Longevity

- [Inulin Prebiotic Fiber](https://magellanlongevity.com/p/201.md) — product graded on this and related evidence
- [Longevity research map](https://magellanlongevity.com/longevity-research-map.html)
- [Evidence-based longevity supplements](https://magellanlongevity.com/longevity-supplements.md)

## Scope and disclosures

Educational information, not medical advice. Nothing here is intended to diagnose, treat, cure, or prevent any disease. Talk to your physician before starting any supplement or device, especially if you are pregnant, nursing, or taking medication.

Editorial firewall: evidence grades are assigned from the published research and are independent of any affiliate commission. As an Amazon Associate, Magellan Longevity earns from qualifying purchases.

Reviewed for accuracy by a board-certified physician (DO).