Evidence-Backed Benefits of Drinking Kefir Milk Every Day (Part3)
Partial Breakdown of Lactose During Fermentation
During fermentation, lactose is partially metabolised by microorganisms. This biochemical change explains why some individuals report better tolerance to fermented dairy compared to fresh milk.
From a nutritionist’s view, this does not make kefir milk “lactose-free,” but it may be more suitable for certain individuals when consumed in small amounts.
How LAB, AAB, and Yeasts Convert Milk During Kefir Fermentation
During kefir milk fermentation, lactose is not simply “removed”. Instead, it is metabolised through multiple microbial pathways, depending on whether the microorganisms involved are lactic acid bacteria (LAB), acetic acid bacteria (AAB), or yeasts.
Each group converts milk components differently, resulting in a biochemically transformed food, not just milk with added cultures.
Overview: What Milk Is Converted Into During Kefir Fermentation
Microbial Conversion Pathways in Kefir Milk
| Microbial Group |
Acts On |
Converts Milk into |
Functional Outcome |
| LAB |
Lactose, proteins |
Lactic acid, peptides, amino acids |
Reduced lactose, tangy flavour, altered proteins |
| AAB |
Fermentation intermediates |
Acetic acid |
Complex acidity, preservation effect |
| Yeats |
Simple sugars |
CO₂, trace ethanol |
Light effervescence, aroma complexity |
Important clarification: Why Lactose Is Only Partially Reduced
From a nutritionist’s perspective, it is critical to state clearly:
- Lactose is reduced, not eliminated
- Amount remaining depends on:
- Fermentation time
- Temperature
- Grain-to-milk ratio
- Kefir milk is not lactose-free by default
This is why fermented dairy may be better tolerated by some individuals, but suitability varies.
Lactose Conversion Summary: Fresh Milk vs Kefir Milk
| Aspect |
Fresh Milk |
Kefir Milk |
| Lactose state |
Intact |
Partially broken down |
| Organic acids |
Absent |
Present |
| Protein structure |
Intact |
Partially broken down |
| CO₂ |
Absent |
Present (trace) |
| Ethanol |
Absent |
Trace (<1%) |
Writer’s Summary
From a health and nutritional standpoint:
Kefir milk is a biochemically transformed dairy food, shaped by microbial activity during fermentation.
Its nutritional relevance comes from:
- Newly formed compounds
- Modified milk components
- A changed food matrix
These factors explain why kefir milk continues to attract interest in nutrition science and why it cannot be accurately described as “just milk with bacteria added.”
Temui kefir kaya probiotik VeeOne untuk kesihatan usus & kesejahteraan. Beli secara dalam talian sekarang untuk pemakanan semula jadi yang dihantar segar ke pintu rumah anda!
Posted by VeeOne Sdn Bhd on 28 Apr 26
Malaysia