Hi Maureen,
My pre-op diet is about 30 days. It changes a little day to day but the main idea is 3 shakes a day + 2 very small meals.
The shakes are 190 calories and 14 grams of protein.
The meals consist of 3oz of meat and 1 serving or either veg or fruit.
The 24 hours before banding I am to have only clear liquids.
While my pre-op is much more merciful than some, it is longer than most.
The key, I believe, is to shrink the liver, and I've read that a low carb/high protien VLC, very low calorie, diet will do that.
During the operation they will need to lift the liver to make the tunnel in which our bands will fit.
I know the pre-op depends greatly on the doctor.
Hope this helps.