question about your weight after diet.....

Hi everyone, I am about to do a 21 day Master Cleanser...I have done it once before but I broke it after 11 days, and I did not properly eat afterwards...I pretty much let the diet go to waste! I ended up gaining all my weight back...I was just wondering, did you guys gain all your weight back?? Is it even possible to keep the weight off??? Thanks so much!

sophia