I've finally figured it out. Anytime I have ever tried a protein shake (any variety over 15 grams), my blood pressure explodes, and I pass out. To prepare for surgery, I cooked protein packed foods and stored them in my freezer so that I won't have to purchase any protein powders. I wonder if anyone else discovered that they too were extremely sensitive to protein products?

Hard to imagine anything in a protein shake or powder that would cause your bp to spike so high that you lose consciousness. What does your doctor say?

I wonder if it shocks my system into metabolizing it, and causing distress. I've had it with Ensure, and with a protein gel. I will be seeing the surgeon today.

Hypoglycemia can, in extreme cases, result in passing out but I've never heard of it being tied to protein intake. Please let us know what your surgeon says.

15 grams of what? protein or sugar? if it is the sugar, there are ones that have much less than that. I use Premiere Protein which only has one gram of sugar per serving. It is also gluten free (I am). Have you discussed your condition with your doctor?