Аргументируйте ! Вот Вам несколько «не русских» ссылок о пользительности пробиотиков и кефира в частности.  http://www.probioticnutrition.com/http://www.medicinenet.com/probiotics/article.htmhttp://www.thenibble.com/reviews/nutri/probiotic-food.asphttp://www.seedsofhealth.co.uk/fermenting/kefir.shtmlhttp://healthmad.com/nutrition/the-extraordinary-health-benefits-of-kefir/http://users.sa.chariot.net.au/~dna/kefirpage.htmlhttp://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WP9-47MHSRX-8&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1015272365&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=845b581b36b998a8f45ad3898086c0e4http://www.kefirforhealth.com/http://www.yourkefirsource.com/kefir-benefits/kefir-health-benefitshttp://www.organic-cultures.com/Kefir_culture.htmlhttp://www.helium.com/items/357805-the-health-benefits-of-kefirhttp://www.happyherbalist.com/tibicoslivegrains.aspxhttp://www.zoogloea.com/http://www.reviberoammicol.com/2006-23/067074.pdfhttp://www.adajournal.org/article/PIIS0002822303002074/abstracthttp://pubs.acs.org/doi/abs/10.1021/jf049617ghttp://en.wikipedia.org/wiki/Fermented_milk_productshttp://en.wikipedia.org/wiki/Probioticshttp://en.wikipedia.org/wiki/Kefir