For 5y+ RNYs, why is it possible to overeat and regain?

Does the dumping syndrome lessen with time? Does the stomach pouch stretch over time (and with bad eating habits)? What's going on that would allow an RNY to gorge and not suffer the nausea/dumping effect? Some of really long-termer RNYs indicate that they are regaining a lot of their pre-op weight. I'm curious as to their opinion of what's allowing them to do so. (I'm in the initial stage of requesting RNY). Thanks!

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