I had the same issue. My doctor told me to stop the shakes because the water was sooooooo much more important. He suggested trying to make my own shakes with Greek yogurt and fruit. I still can't seem to get in 64 Oz but I sure am trying!!! But ya anyway it Depends on the doctors though I'm sure. I would talk to yours and see what they say good luck and keep in mind it won't last forever!