This is my first post. I start my pre opp diet on saturday, and my surgery is on june 29 in toronto, canada. I am exicted and nerves all in one but i know i can do it with the help of my husband and my family. I have to do a pre opp diet for three weeks. i have three protein shakes a day and low calarie veggies. I was told it is to try to get ride of up to 25% of fat in your liver to make the surgery safer.