I think another important aspect of the whole yogurt (and KEFIR) discussion is candida.

No one brought it up in this thread, though it is in many of the referenced articles on yogurt.

But especially to newbies - many of us who were previously prone to eating hi-carb are likely to be suffering from presence of candida (yeast). This can be true even if there are no overt symptoms (btw, this is a controversial point in medicine, but I think it is the same people who say Atkins is bad for you who disregard this theory!)

Candida can lead to carb cravings, fatigue, weaker immune system, poor sleep patterns, upset stomach, diarrhea/constipation, and for women - genital yeast infections.

One of the major benefits of Atkins (to me) is that in addition to weight loss, this is the best treatment for candida.

And yogurt/kefir are powerful weapons in that war.