I am 4 days pre op (Sept 9, 2008)
My BMI is 40 and I have been under dietician supervision for a year prior.
My instructions were to do liquid diet (4 x Ensure High Protein and 3 x 250ml Skim Milk) for one week prior to surgery.
The dietician explained it was to shrink my liver to enable the surgeon to see.
I am on my fifth day. Days three and four were he worst for headaches and fatigue.