Metabolic & Cardiometabolic
Do plant compounds slow how fast starch digests?
The claim, precisely: starch-polyphenol complex decreases starch digestibility
Yes, but only shown in the lab and rodents so far, with hurdles like bitterness and baking breakdown.
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: Animal studies (Animal)
How the studies fall
What the evidence shows
Starch-polyphenol V-type complexes slow amylolysis by a dual mechanism (physical barrier + direct amylase/glucosidase inhibition), lowering glucose and even raising GLP-1/PYY in rodents — partly achievable by adding polyphenol-rich flours to dough. Limits: astringency at effective dose, polyphenol bake-instability, no human glycemic data.
The evidence (6)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| (persimmon tannin-starch) 2018 · (rat) | animal | supports | moderate | [FT-verified] Li 2018 persimmon tannin-starch dose-dep AUC suppression rat + amylase IC50. ANIMAL |
| (gallic/tannic-starch) 2025 · (mouse) | animal | supports | moderate | [FT-verified] Zheng 2025 V-type galloyl-HAMS lower digestion higher GLP-1/PYY+satiety mice. ANIMAL |
| (hawthorn polyphenol-starch) 2024 · (mouse) | animal | supports | moderate | [FT-verified] Hawthorn polyphenol-starch 2024 SDS+RS up; mouse glucose peak 14.30->11.77. ANIMAL |
| (hawthorn polyphenol-starch) 2024 · (mouse) | animal | supports | moderate | Hawthorn polyphenol-starch: SDS+RS up; mouse glucose peak 14.3->11.8 mmol/L |
| (persimmon tannin-starch) 2018 · (rat) | animal | supports | moderate | Persimmon tannin-starch: dose-dependent AUC suppression + enzyme inhibition (rat) |
| (gallic/tannic-starch) 2025 · (mouse) | animal | supports | moderate | Gallic/tannic-HAMS: slower digestion, raised GLP-1/PYY, improved satiety (mouse) |
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.