So my surgery is scheduled for end of August. I have been put on a bariatric protein shake for breakfast and dinner. I am allowed to eat a lunch that consist of 3-4oz lean meat and 1-2 cups of certain veggies, no more than 500 calories, low fat. I have to lose 40lbs before surgery. Anyone else have to do this? If so how did you get through it and how well did it work?