I went five weeks on my pre op diet as well. In all honesty it sucked but I had peace of mind that I did all I could for a safe and smooth operation. It did get easier as I went along but nothing was worse than watching the Super Bowl with all my buddies eating loads of pizza and wings while I sipped on a muscle milk lite hahaha. I also think that it helped set me up to be successful so far by breaking habits of eating late/ or grazing. Best of luck to you!