Question
Will you be meeting with a dietician or nutricionist before your surgery? If so, they will give you all the details. If not, your doctor's office should be able to give you a hand-out that outlines the different stages of re-feeding after surgery.
Start there. You should follow your doctor's procedures. I know that you will get lots of different opinions on the protein powder. Everyone has their favorites. Mine is Isopure :-)
Regards and hugs,
Ronna

Ronna