pupichupi - Have you tried making your Protein shakes with half Water and half milk? That is one way that my nutritionist suggested that I make them. Another thing she told me is that a lot of people have issues with lactose post op, so she has me use Smart Balance Lactose Free Milk when I make my protein shakes. I am also 3 weeks post op and the protein shakes don't bother me one bit. I was a little hesitant to try the lactose free milk at first because I was scared it would have a bad taste, but it actually tastes just like milk. Best of luck!