Hi jonno, i'm on the pre op diet and although it is very hard, i'm sticking to it like glue. It's all about shrinking the liver for surgery, if it hasn't, then no op i'm afraid. I'm not even thinking about losing weight on it, this will happen automatically because of how little food we are eating. Just see it as an added bonus.
Try Try and Try to stick to your giudelines, it'll be so worth it hun x