how do you regained most of the weight back after a rny?

i had a RNY 3-11-08 i been reading on here some people have lost over 200 hundred pounds and then gain it back how does that happen if you had a RNY? should i be worry?

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.