In the week before my surgeon's appointment where I expected to get my pre-op diet instructions, I snarfed down EVERYTHING I could think that I might miss. I remember sitting and watching Biggest Loser (right?) while munching a triple cheeseburger, onion rings, and ice cream. I felt like a hypocrite but it was part of my "food funeral" experience.
When I went to my pre-op visit, I was ready and prepared. They said I could just start the next day since I would be there during lunch, but I wanted to get started so I drank a shake right there. I was READY!
I honestly think the same approach in a different person (or in me at a different time) may have triggered a binge that made it difficult to stick to the pre op diet.
I did have a little freak out the day before surgery, but I got through it. And, with the help of my blog, my TT family, and my incredibly supportive friends and family at home, I have done a great job completely changing my relationship with food and developing a whole new, healthy taste preference post op.
You will likely get several different perspectives on this question (and just about any other you might ask.) That's what I love about this forum, you get ideas and POVs from so many different people to use as you see fit. Just keep in mind this whole process takes HARD WORK and, to really be successful, you have to figure out what works for you.