If we're having a thread on nutrition, I want to ask HN about Kefir (fermented milk/yogurt from Russia/East Europe), whether they have tried it, and why there i

If we're having a thread on nutrition, I want to ask HN about Kefir (fermented milk/yogurt from Russia/East Europe), whether they have tried it, and why there isn't more interest in it considering it has a lot of health benefits?