How do I ask this? I have been trying to diet without luck...3 months of less than 1000 cal and 1 hour of hard labor a day without a loss. Doctor said I was starving, so I went up to 1800 cal for 6 months- nothing! All of my doctors are now routing for me to get a sleeve. So I am just researching the pre-op for a sleeve and one website said post-op is 2 weeks NO calories. ? HERE'S THE ? So those of you on the pre-op liquid diet, do they recommend how many calories or just how many bottles of the shakes?