My surgery is tomorrow (11/7) and I have been on a "liquid" pre-op diet for 2 weeks now and as of this morning, I have lost 15 lbs. My surgeon requires this to shrink the liver, etc. and it consists of 4-5 Protein shakes, broth, sugar free Jello, popsicles and 8oz of low carb yogurt (my big treat of the day).
The first 4-5 days were really hard and then a swtich went off and I was no longer hungry. That doesn't mean I don't want to eat something, I am just not physically hungry for some strange reason.
As much as I complained in the beginning, I have to admit that this phase has been worth every minute. It has given me a chance to really evaluate the decision I have made. As many say, this is not an easy fix and these two weeks have proved that already.
Good luck to you!