Hello! I am scheduled for the sleeve on 9/26 also. My surgeon requires a 2 week pre-op diet that consists of a Protein shake for Breakfast and lunch and then for supper you can have 4 to 6 ounces of lean meat with 2 servings of low carb veggies. The nurse suggested adding Protein Bars if you need a snack. I've lost 5 lbs just since Wednesday.
As far as Protein shakes, I've tried different brands of protein both premade and powders and my favorite are unjury and Bariatric fusion. Unjury is cheaper between the two. I ordered samples of different brands to try before ordering whole bottles. I hope this helps!
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