When I did my blood work and stress test pre-surgery I also had to go caffeine free. Can I suggest if at all possible steering away from the sleeve. The sleeve starts to fail around year five and you will end up having to get another surgery (usually gastric bypass). If you decide the more invasive route go gastric bypass if you can. The sleeve has the most stitches off all these surgery and the highest rate of sepsis occurring. It is the one that has the most likelihood of a stitch letting go within the first 48-72 hours which is the most crucial time as the stomach needs upto 72 hours to seal itself off again where it was cut. And besides that it kinda defeats the purpose in my opinion to get the sleeve if 5 years later you have to go get the bypass done anyway. I figure if you have to get it done anyway why do surgeries when you can do one. Keep us uptodate on your progress and let us know your decisions. :-)