"Weight Loss Window"

I don't understand why we have a "weight loss window" of opportunity. What is it that changes after 12 to 18 months? It seems to me the physical changes of the rny surgery would be permanent. However, if that were the case I suppose we would continue to lose weight til we faded away! Is it that our stomachs will stretch back out, or is it some other factor? Won't the malabsorption caused by the bypassing of intestines (I had a distal) continue to be a factor after the 12 to 18 months?

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