I don't start my pre-op diet until Wednesday,but my friend lost 10lbs on her pre-op diet. I'm only required to do a 7 day diet thank goodness!! I'm stocking up on the sugar free jello and sugar free popsicles. I had to go to 3 stores to find the Carnation no-sugar added breakfast drink in Chocolate. I just keep telling myself this is all going to be worth it!!