Kefir-riffic

You've probably heard all about the nutritional and restorative properties of kefir. And if you haven't, here they are:

It cleanses the intestines, provides beneficial bacteria and yeast, vitamins and minerals, and complete proteins. Because kefir is such a balanced and nourishing food, it contributes to a healthy immune system and has been used to help patients suffering from AIDS, chronic fatigue syndrome, herpes, and cancer. Its tranquilizing effect on the nervous system has benefited many who suffer from sleep disorders, depression, and ADHD (attention deficit hyperactivity disorder).

The regular use of kefir can help relieve all intestinal disorders, promote bowel movement, reduce flatulence and create a healthier digestive system. In addition, its cleansing effect on the whole body helps to establish a balanced inner ecosystem for optimum health and longevity.
Kefir can also help eliminate unhealthy food cravings by making the body more nourished and balanced. Its excellent nutritional content offers healing and health-maintenance benefits to people in every type of condition.

(Source: http://www.kefir.net/)

Of course, after this glowing recommendation, I've been searching high and low for this elusive product. I am not exactly a DIY person, and the idea of getting a starter culture, fermenting it (hygenically, to boot) and waiting for it to transform into the miraculous ambrosia does not really appeal to me. So, I was thrilled when I found this ready-made low-fat kefir smoothie sitting on a shelf in our local farmers' market. It had the consistency of thick buttermilk. When consumed plain, it tasted really sour. But sour curds and sugar used to be my favorite snack, as a kid. So, I mixed spoonfuls of sugar into the smoothie, and attacked it with gusto. It did taste much better. After a few mouthfuls, though, noisy rumbles started emanating from the abdominal area, that quickly progressed to a roar. Luckily, after an hour or so of firecracker activity, peace was restored. Hmmm...what was that all about?

Any similar kefir experiences?