Its the probiotic aspect that made me interested.
I can't remember where, but I have been noticing references to how important the gut biome is, and a while back I started to make my own coconut yogurt (yum, but a bit of a phaff).
Then I read that yogurt bacteria are great, but they don't move in and set up colonies, they just arrive, live for a while, and then die out. So you have to keep eating them, to keep replenishing them.
Kefir colonies are different. they are a combo of fungus and bacteria, and they do (or at least some of them do) move in and set up shop. so there is less need for daily doses - frankly, I have no desire to eat yog every day for ever, whereas a small swig of yog drink most days (aka kefir) seems much more manageable.
As for the bg impact:
My testing was delightfully consistent.
After 250ml of kefir, my BG rises approx 0.5mmol/l at 45 mins, and stays there til 1.5 hours. At 2 hours, it is back down to fasting level, or maybe a fraction lower.
Here is the best site I found for all those FAQs
http://users.chariot.net.au/~dna/kefir-faq.html#leavingkefir
