When you lose weight from fasting do you gain it all back even when you start eating small meals and exercise a lot?

Okay, in a month of waterfasting, you loose about 2lbs of muscle because the body need that protein, after that the body know longer takes the muscle until it runs out of fat that is stored on your body and if you are over weight that can take a while. you can gain the weight back if you go back to your old eatting habits but the fast is ment to break you of the ways you use to eat. when you break the fast you are ment to add 5 days to every day that you fast for, so fast for 3 days spend 15 breaking it, when you break the fast start by eating veggies and fruit and add the other stuff after, your system is resting during the fast so if you were to start eating bread and all that stuff your body cant digest it yet so you gain weight from it. so take it easy after the fast your body is pretty much sleeping and has to wake up.