My pre-op starts in 2 days... (Wow, saying that makes it seem very real, and very soon!)
The nutritionist at my surgeon's office (NYU Langone Medical Center - I'll mention it in case there are any others in the NYC area) recommended GNC's Total Lean (ready to drink) shakes. I've tried the Vanilla and Strawberry and they're pretty good. I've drank a few over the past week, because I like the taste, but I am worried about 5 of them sufficiently filling me up. I tried the powder equivalent and it was gross! I ordered a bunch online including Banana Cream and Swiss Chocolate, which all had good reviews online.
I had asked my surgeon about whether people took off work during pre-op due to having low energy from the low cal diet. She said (like many here who have been through it), that most people don't find it too bad, and she said I'll have lots of energy while I'm losing weight. I guess I will see in 2 days!
She also said that doing the pre-op diet makes surgery a lot safer, and if someone doesn't follow it properly and their liver doesn't shrink, then they might not be able to do the surgery laparoscopically, and they'll have to cut you open all the way (now this is just *my* surgeon talking) - this will make it easier for me to stick with it tho!