Metabolic & Cardiometabolic · Gut & Microbiome
fiber-derived SCFA increases GLP-1
In plain terms: Does fibre raise the appetite hormone GLP-1 soon after eating?
Modestly and inconsistently — fibre's gut by-products can nudge it up, but short-term human results often don't show it.
📅 Last reviewed: 2026-07-15 ⓘ
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
Contested — the SCFA->FFAR2/3->GLP-1 chain is well shown in mice, but acute human tests mostly miss GLP-1. Inulin and fiber-rich meals raised SCFA or colonic fermentation yet left GLP-1 unchanged in several crossover RCTs (rahat-2017; van der Beek 2018, PMID 29953876; the brown-bean evening-meal trial, PMID 23577078), and an inulin-propionate ester did no better than control inulin (Byrne 2016…
The evidence (13)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Sandberg JC, Björck IM, Nilsson AC 2016 · PLoS One | RCT | supports | moderate | High-fiber rye kernel evening meal improved next-morning glucose regulation and appetite variables via colonic fermentation (SCFA-gut hormone). |
| Chambers ES, Viardot A, Psichas A, Morrison DJ, Murphy KG, Zac-Varghese SE, MacDougall K, Preston T, Tedford C, Finlayson GS, Blundell JE, Bell JD, Thomas EL, Mt-Isa S, Ashby D, Gibson GR, Kolida S, Dhillo WS, Bloom SR, Morley W, Clegg S, Frost G 2015 · Gut | RCT | supports | high | Colon-targeted inulin-propionate ester acutely raised postprandial GLP-1 and PYY and cut energy intake |
| Mazhar M, Zhu Y, Qin L 2023 · Foods | observational | supports | low | Review: dietary-fiber-derived SCFA promote L-cell GLP-1 and PYY release via GPR41/43, improving glucose homeostasis in T2D. |
| Tolhurst G, Heffron H, Lam YS, Parker HE, Habib AM, Diakogiannaki E, Cameron J, Grosse J, Reimann F, Gribble FM 2012 · Diabetes | animal | supports | moderate | SCFAs trigger GLP-1 from L-cells via FFAR2; ffar2/3-null mice show blunted SCFA-evoked GLP-1 |
| Rahat-Rozenbloom S, Fernandes J, Cheng J, Wolever TMS 2017 · Eur J Clin Nutr | RCT | contradicts | moderate | Inulin raised serum SCFA but did not increase GLP-1 or PYY (possible obesity SCFA-resistance) |
| Vanslette AM, Toft PB, Lund ML, Moritz T, Arora T 2023 · Eur J Pharmacol | animal | contradicts | moderate | Sodium propionate did NOT rescue HFD-induced GLP-1 reduction (only 5-HT4 agonism did) |
| Chambers ES, Morrison DJ, Frost G 2015 · Proc Nutr Soc | mechanism | supports | moderate | Narrative review, no new data: 'Investigations using FFAR2- or FFAR3-deficient animal models suggest that SCFA-mediated stimulation of these receptors enhances the release of ... glucagon-like peptide-1 from colonic L cells'; 'The present review therefore proposes ...'. Animal-based, not human acute - zero weight. |
| Karthick V, Thamarai R, Amalraj S, Nagarajan K, Manimegalai G 2026 · Journal of molecular histology | meta-analysis | supports | moderate | Systematic review: SCFA (acetate/propionate/butyrate) from dietary fiber fermentation signal via GPR41/GPR43 on enteroendocrine/immune cells to stimulate GLP-1 and PYY; clinical/experimental studies report high-fiber or SCFA-enriching inter |
| Nilsson A, Johansson E, Ekström L, Björck I 2013 · PLoS One | RCT | contradicts | moderate | Randomised crossover (n=16 healthy young adults, Lund): brown-bean vs white-wheat-bread evening meal (35 g available starch; 31 vs 3.4 g total DF), standardised breakfast 11-14 h later. Colonic fermentation rose (breath H2 +141%, plasma propionate +16%, isobutyrate +18%), PYY +51% and ghrelin -14%, but 'No effects depending on evening meals were detected in fasting- or postprandial GLP-1 concentrations the following morning': GLP-1 AUC 0-180 min 190 vs 187 pmolmin/L (+1.6%, ns). SCFA rose without a GLP-1 rise; trial powered on glucose IAUC, not GLP-1. |
| Steinert RE, Mueller M, Serra M, Lehner-Sigrist S, Frost G, Gero D, Gerber PA, Bueter M 2024 · Nutr Diabetes | RCT | tested-null | low | Acute 25 g inulin vs maltodextrin, 8 RYGB patients before/after surgery: 'we failed to detect any effect of inulin, MDX, or surgery on plasma SCFAs' and 'The early-phase hormonal responses after surgery were comparable between inulin and MDX' - the 30-min GLP-1/PYY rise occurred 'in response to both inulin and MDX', so it is a surgery effect, not an inulin effect. Fermentation did occur (breath hydrogen rose with inulin only), but with the SCFA mediator undetectable the SCFA->GLP-1 step was not testable here. |
| van der Beek CM, Canfora EE, Kip AM, Gorissen SHM, Olde Damink SWM, van Eijk HM, Holst JJ, Blaak EE, Dejong CHC, Lenaerts K 2018 · Metabolism | RCT | contradicts | moderate | van der Beek 2018 double-blind crossover, 14 overweight/obese men, 24 g inulin vs maltodextrin in a high-fat shake, 7-h sampling: SCFA produced ('higher plasma acetate concentrations after INU compared with PLA (P < 0.05)') but 'There were no effects on ... satiety hormones GLP-1 and PYY, and appetite and satiety scores.' Null on the claim's object despite confirmed SCFA production = contradicts. No GLP-1 estimate/interval in abstract; small n. |
| Müller M, Hernández MAG, Goossens GH, Reijnders D, Holst JJ, Jocken JWE, van Eijk H, Canfora EE, Blaak EE 2019 · Sci Rep | observational | supports | moderate | Circulating (not faecal) SCFA correlated with GLP-1 and insulin sensitivity in humans; SCFA-GLP-1 link bioavailability-dependent. |
| Byrne CS, Chambers ES, Alhabeeb H, Chhina N, Morrison DJ, Preston T, Tedford C, Fitzpatrick J, Irani C, Busza A, Garcia-Perez I, Fountana S, Holmes E, Goldstone AP, Frost GS 2016 · Am J Clin Nutr | RCT | contradicts | moderate | Byrne 2016 randomised crossover, 20 healthy nonobese men, inulin-propionate ester vs control inulin: 'There was no significant difference in the AUC 0–360 min for plasma PYY, GLP-1, or glucose or serum insulin after subjects received IPE compared with control inulin'; time x treatment P = 0.25–0.58. The authors had hypothesised GLP-1/PYY mediation and call the null 'not in line with our original hypothesis'. IPE did cut energy intake 9.5% and striatal food-reward BOLD, independent of gut hormones. Inventor COI on IPE. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
Opens a short form. You'll sign in with Google so submissions are tied to a real account — we don't display your identity, and we only accept a link we can verify (PubMed, DOI, ClinicalTrials.gov).
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.