I have been drinking Kefir for years because it's so good for my bones. I read about the benefits of Kefir and discovered that it works in your gut to bring the endorphins to your brain. And sends the message of well-being that you get like when you eat chocolate or work out hard. When I open the refrig to get it, the dogs hear me and come running in to get their fix for day. Their tongues hanging out, like they are happy. God forgive if I even run out of Kefir !!