Ok, so from what i understand, Protein concentrate has more carbs than protein isolate, i would check with your nitritionist and see how many carbs you are allowed during your preop diet and use the concentrated protein for preop. You are probably going to have hypoglycemia regardless because your body is used to having way more carbs than its going to get during a liquid diet. Not sure if you are diabetic and take insulin or any other medicine that stimulates the pancreas to increase insulin output, but if you are, you may want to talk with your pcp about decreasing your dose.....hope this helped
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