What You Need to Know
During fermentation, lactic acid bacteria in kefir grains metabolize lactose and fruit-derived fructose/glucose to lactic acid, lowering pH and producing small amounts of ethanol. Fruit phenolics act as antioxidants, stabilizing the matrix and extending shelf life. The process is temperature‑sensitive and time‑dependent, balancing acidity, flavor, and microbial stability.
The Science
Primary Reaction
Lactic acid fermentation of lactose and fruit sugars by kefir grains