Hi Kansas, it's my understanding that lowfat vs. fullfat doesn't matter that much, as long as it has active cultures. The active cultures consume most of the natural sugars, so the yogurt ends up with about 4 carbs per cup.

That said, those bacteria can't eat added sugar, corn syrup etc. So yogurt that contains sugar is a no-no for low carb. I have heard that there's a brand sold at Wal-mart that's sweetened with Splenda rather than sugar, but I always just get unsweetened yogurt. So to sum up, low fat is OK, but flavored with sugar is not

-Sarah