A question for post-ops on metabolism

Does your metabolism change as a result of RNY? I am reading posts of 2+ years out that are regaining weight, and some of them talk about gaining weight eating 1200 calories per day. Wouldn't a "normal" person that did not have WLS be able to eat 1200 calories per day without gaining weight? This is just an example. Could be 800 or 1400. The point is, pre-WLS most would lose on 1200 per day, why do you not later?

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