can one keep the weight loss post fast?

Hello all,I have done many Water Fasts in the past, one 20 day one, my longest, one 16 day one, pure water fast, and many many 2 and 3 day little fasts, in addition to a 5 day juice fast at some point...at the moment I am finishing a 21 day Water Fast on tuesday and I don't want to gain all the weight back again....every time I come off a fast I start out greatly, bananas, coconut water, prunes, all the good stuff, and then pow!!! I start eating like there's no tomorrow....this time I have already lost 20 pounds, I will probably go down another 3-4 by tuesday, which will put me to a nice 112 lbs, a wonderful weight for my height...my question is: what can I do to keep the weight loss, I read about oj diet, master cleanser, just fruit, but how much and for how many days?.....if I do a 14 day oj fast will I keep my weight loss intact????thanks in advance for any input!!!!
katie