<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.watu mbalimbali kuguswa tofauti na caffeine, na baadhi ya watu wanaweza uzoefu kuongezeka hisia jittery kutoka caffeine.  <response>: they are made from different kinds of cultures, some people think that kefir has a milder taste. 