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
The elegant SCFA->FFAR2/3->GLP-1/PYY satiety chain repeatedly fails to translate acutely in humans: inulin raised serum SCFA but did NOT raise GLP-1 or PYY. Mechanism != outcome — do not promise satiety-hormone effects.
The evidence (13)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Sandberg 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, et al. (Frost) 2015 · Gut | RCT | supports | high | Colon-targeted inulin-propionate ester acutely raised postprandial GLP-1 and PYY and cut energy intake |
| Mazhar 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 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, et al. 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, et al. 2023 · Eur J Pharmacol | animal | contradicts | moderate | Sodium propionate did NOT rescue HFD-induced GLP-1 reduction (only 5-HT4 agonism did) |
| Chambers 2015 · Proc Nutr Soc | mechanism | supports | moderate | Review: colonic SCFA stimulate FFAR2/3 on L-cells, enhancing GLP-1 and PYY release; mechanistic basis for fiber-driven incretin secretion. |
| Karthick V et al 2026 · study_type: meta-analysis | 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 2013 · PLoS One | RCT | supports | moderate | Brown-bean indigestible carbohydrate evening meal favorably altered metabolic markers and appetite-regulating hormones at subsequent breakfast. |
| Steinert 2024 · Nutr Diabetes | RCT | supports | low | Oligofructose-inulin increased breath hydrogen, SCFA and gut-hormone (GLP-1/PYY) release vs maltodextrin in RYGB patients. |
| van der Beek 2018 2018 · Metabolism | RCT | mixed | moderate | Inulin raised SCFA production and fat oxidation in overweight men but acute GLP-1 rise was modest; supports fermentation-SCFA pathway, weak hormone signal. |
| Muller 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 2016 · Am J Clin Nutr | RCT | tested-null | moderate | Colonic propionate delivery reduced reward responses to food; SCFA-to-gut-hormone axis active but GLP-1 readout secondary. |
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