How much you will lose depends on your age, sex, weight and metabolism. My surgeon also required a one week pre-op liquid diet that averaged about 700-800 calories a day. The average weight loss in his patients for that week was 5-12 pounds but a lot of that "weight" is water weight. As your surgeon stated, the purpose of the diet is to shrink the liver to make the surgery easier. Good luck!

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Elisabeth :)

Highest Wt 440 lbs
Banded on 3/30/06 (351 lbs) in U.S. (11 cm VG Inamed Band, 11 fills in 2.5 yrs)
Never felt restriction and developed SEVERE ACID REFLUX

4/1/09 Revision from Band to VSG in Mexico
4/2/09 Acid Reflux Gone!
VSG Starting weight 285/Goal 130