want to know honestly what the difference is between distal or proximal

ok, i have been a participant on this site for three months or more. i am scheduled for lap rny on 5/31/00. i want the distal rny but none of the surgeons in my state(that are bariatric certified surgeons) will do the distal rny. I want to know if someone with a medical backround, or anyone with information that is valid, what the real difference is in the average amount of weight lost, and the average percent of people who keep the weight off. I have about 180 lbs to lose, I do not by any possible means want to gain this weight back. I need some assurance for myself that if I have the proximal rny I will not gain the weight back. Any help from anyone is greatly appreciated!!!

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