
Here's some relief on this issue: Buttermilk is perfect for diabetics. Why? The sugar in buttermilk, like all dairy products, is Lactose. Lactose tends not to raise blood sugar like other sugars. If you don't believe it, try drinking a large glass and taking a reading. If you're like me, you'll get almost no reaction.
As a Type II diabetic, I drink lowfat milk and buttermilk all the time. My A1C is 4.9.
Enjoy your recipe, and remember, not all sugars raise blood sugar!