Any theories as to why some WLS patients gain weight over the years?

I'm just curious and I know I'm putting the cart before the horse as I am only 5 months postop and not even close to my goal. Occasionally I hear of people that have had the more updated surgeries like RNY but are gaining weight after a few years. Does anybody have any theories or facts as to why this happens? Have they stopped exercising after the weight loss? Does the body eventually adjust to the surgery and lower metabolism after a few years? Is it the result of surgery failure or patient noncompliance? Does the patient slip back into some old habits? If the surgery works well enough to help the patient lose weight why doesn't the patietn always keep the weight off? I don't want to tick anybody off with this question, I just want to do everything I can to keep the weight off once I get it off. I personally know a lady that had prox RNY (which is what I had also). She is almost 2 years postop and has gained about 30 lbs in the past year after losing around 100 lbs (I know sometimes if someone is underweight they might gain a little weight but this wasn't the case for her). I don't have the nerve to ask her why she gained the weight but I know she hurt her foot and probably wasn't able to exercise for a while. Please, when answering this question I don't really want to read a bunch of "my surgery is better than your surgery" posts that seem to prevail on this site. I'm sure there have been distal RNY and DS patients who have gained weight also.

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