No one knows for sure; each person has their own experiences. However, since weight loss tends to slow for most around the 18 month mark, that is a safe benchmark I suppose.
Even at nine years post op, I believe I have SOME malabsorption of fat because I can see it in my BMs! Of course, I also no longer have a gall bladder so that may contribute in part.
Assume that the malabsorption of vitamins and minerals is forever, however....keep taking your supplements!
Marilyn (now in NM)
(updated March 2012)
Dave Chambers, 6'3" tall, 365 before RNY, 185 low, 200 currently. My profile page: product reviews, tips for your journey, hi protein snacks, hi potency delicious green tea, and personal web site.