How can one gain weight on such a

I'm curious since I will be undergoing the procedure in a few weeks. I see some posts on how much others are eating, which to me seems like what a "normal" person would eat. The posts also show they are afraid of or are gaining the weight back. How can this happen? I can see eating junk food and stuff, but not regular foods. Is our metabolism really that messed up that any amount of food can cause weight gain or is this an issue only for the first year or so?

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