I had an RNY, and my doc said on average, a patient would lose 70% of excess weight long term, most of that in the first six months. I have done better than average (overall, I've lost 105% of excess weight, and am within 2 lbs of the middle of the range for normal BMI), You can see my weight loss every few months on my signature. With a sleeve, it may be a little different, because there is no malabsorption.
Good luck with your surgery!
Eliza
Consult:239 SW:217 1mo:195 2mo:182 3mo:169 6mo:139 9mo GOAL CW: +2 from underweight