Yes i had RNY bypass 17 yrs ago,Lost weight even lost to much,had to have feeding tube for a while,One thing like all of the surgeries,Is Disapline,The surgery works but it is up to you to make it succeed,And that is in your head,It's a tool and can help you if you eat,drink and have will power,If you don't,Forget It within 10 to 20 pounds,Those pounds are going to creep back home,These surgery is a tool your brain makes it work.