When most people go off a fad diet, because they've been deprived of some food groups they over indulge or binge which is why they put on more weight. Your body doesn't automatically produce extra fat from thin air or water because you stopped your diet.
So what is the most effective way to get off a fad diet, overindulge and keep the weight off? Simple, the day you go off the diet eat whatever you like,binge,overindulge or whatever but the days after are KEY!
The next day you start eating clean, what does it mean to eat clean? read this article to find out .
Overindulging one day a week is not going to undo all your hard work in fact most body builders will argue that it helps you in the long run, by reseting your metabolism.
Clean eating this the key to keeping the weight off after any diet program. Do it 3-5 days a week for great results! I did it and it worked for me after failing on the atkins and Dukan diet.