what exactly determines amount of weight loss?

is it pouch size or amount of intestine bypassed? also, what determines long term success (besides following eating and exercising regimen). just wondering what questions to ask my dr on my next visit. i want to be able to understand what he means when he talks about distal vs. proximal. i am 5'4 and 270lbs. i would like to lose 120 - 130lbs. is that too much to hope for?

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