Research
Hormonal
Fermentation reduces the glycemic index (GI) of fermented foods through the production of organic acids (lactic, acetic, propionic) which suppress starch-hydrolyzing enzymes and delay gastric emptying.
If you are managing blood sugar, consider incorporating fermented grain products like sourdough bread. The organic acids produced during fermentation can help blunt post-meal glucose spikes compared to unfermented breads.
GoodSupportsMEDIUM confidence
The low GI of fermented food has been attributed to the short- chain organic acids produced during fermentation such as lactic acid, acetic acid, and propionic acid... Eating lactic acid fermented foods reduced postprandial blood glucose spike... The mechanism for the glucose- lowering action of lactic acid has been suggested to be due to a lowered rate of starch hydrolysis in the upper small intestine
Why this rating
Cites multiple studies on GI reduction, though notes conflicting results depending on the type of fermentation and food matrix.
Source
Fermentation and germination improve nutritional value of cereals and legumes through activation of endogenous enzymes
Smith G. Nkhata et al. · Food Science & Nutrition · 2018
DOI 10.1002/fsn3.846
narrative_reviewCited 818×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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