first and foremost, I would simply ask your surgeon to recommend what is best in your situation. However, my surgean has a presurgery diet that he requires each patient to do for two weeks prior to the . there are a couple of different scenarios, but they are all basically the same except that men get 200 additional calories than women.
2-- atkins advantage shakes,
2-- 8oz glasses of skim milk,
2-- cups of vegetables (no corn, peas, potatoes),
2-- small fruit.
you are allowed unlimited broth and sugar free popsicles/jello.
I have lost 18 lbs in 10 days. This diet was designed to quickly reduce the fat in/around a fatty liver, which is important to do before the sleeve surgery.
Hope this is helpful.