Dat wordt overal op internet geroepen (google maar eens op kefir colonizes gut). Daarmee is het natuurlijk niet per definitie waar, maar ook ons aller Sally Fallon zegt het:
Kefir is a cultured and microbial-rich food that helps restore the inner ecology. It contains strains of beneficial yeast and bacteria (in a symbiotic relationship) that give kefir antibiotic properties. A natural antibiotic--and it is made from milk! The finished product is not unlike that of a drink-style yogurt, but kefir has a more tart, refreshing taste and contains completely different organisms...kefir does not feed yeast, and it usually doesn't even bother people who are lactose intolerant. That's because the friendly bacteria and the beneficial yeast growing in the kefir consume most of the lactose and provide very efficient enzymes (lactase) for consuming whatever lactose is still left after the culturing process...kefir is mucous forming, but...the slightly mucous-forming quality is exactly what makes kefir work for us. The mucous has a clean quality to it that coats the lining of the digestive tract, creating sort of a nest where beneficial bacteria settle and colonize...
En Dom van de kefir pages zegt:
Candida albicans has never been isolated from kefir grains [as far as the author is aware at the time of writing]. Conditions make it quite difficult for this particular opportunistic yeast to flourish among the microflora of kefir grains and in kefir. Certain yeasts of kefir include Candida as part of the nomenclature [name]. These yeasts are not pathogenic yeasts as such, but are classified as Generally Regarded As Safe [GRAS]. Some yeast strains of kefir may have the potential to keep C. albicans in check in the host, for research has shown that certain yeast strains of kefir can colonize the gut, giving C. albicans competition for nutrients or good inhibition by some form of chemical action by yeasts, and or the Lactic acid bacteria [LAB] of kefir. Kefiran may also play an important role in this, for research has shown kefiran markedly antagonized the growth of C. albicans, including other strains of unfavourable fungi and bacteria.
Maar een echt hard bewijs is dit inderdaad niet en dat zou natuurlijk het mooist zijn.