Pharmaceuticals (Basel, Switzerland)Oct 27, 2026

How Plant Compounds Affect Blood Sugar After Eating by Targeting Digestive Enzymes and Blood Sugar-Regulating Hormones

GLP-1 Therapies Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Oct 28, 2026

Abstract

Flavonoids exhibit structure-dependent and time-dependent inhibition of carbohydrate-hydrolyzing enzymes.

Plant-derived compounds may slow starch breakdown and influence glucose absorption.
Iminosugar-rich mulberry preparations and thiosugar-containing Salacia extracts have shown effectiveness in randomized trials for reducing post-meal glucose levels.
Berberine may enhance GLP-1 secretion through specific receptor interactions, while other compounds like mangiferin and flavonol glycosides are primarily supported by earlier-stage studies.
Variability in enzyme systems across species impacts the effectiveness of these compounds.
Translational value is influenced by factors such as meal composition, enzyme source, and gastrointestinal tolerance.

Simplified

Postprandial hyperglycemia can be modified before absorbed glucose reaches the circulation. Plant-derived compounds may slow starch hydrolysis through α-amylase and intestinal α-glucosidases, stimulate glucagon-like peptide-1 (GLP-1) release, or preserve incretin activity through dipeptidyl peptidase-4 (DPP-4) inhibition. This critical narrative review integrates these mechanisms around intestinal exposure, substrate selectivity, and human evidence. Flavonoids show structure-dependent and time-dependent inhibition of carbohydrate-hydrolyzing enzymes, but results vary markedly between yeast, rodent, and human enzyme systems. Iminosugar-rich mulberry preparations and thiosugar-containing Salacia extracts provide the strongest chemistry-to-clinic examples, including randomized trials that reduced postprandial glucose or HbA1c. Preclinical studies suggest that berberine may link bitter-taste-receptor-mediated GLP-1 secretion with local intestinal DPP-4 effects, whereas mangiferin, flavonol glycosides, anthocyanins, and food-derived peptides remain supported mainly by preclinical studies. In vitro potency alone is insufficient: meal composition, enzyme source, luminal concentration, metabolism, product standardization, gastrointestinal tolerance, and incretin measurements determine translational value. Candidate prioritization requires defined chemistry, achievable exposure, and product-specific human validation; acute effects do not establish durable benefit or human target engagement.

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How Plant Compounds Affect Blood Sugar After Eating by Targeting Digestive Enzymes and Blood Sugar-Regulating Hormones

Abstract

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