One of the best things for maintaining ones normal weight is exercise.
It speeds up the metabolism.
Metabolism is responsible for regulating how fast fuel gets burned up in your system.
Slow metabolism means weight gain.
Fast metabolism means weight loss.
If you don't exercise, its good to start somewhere. Walking is exercise. Take it slow and be consistent.
Consistency is important. Just one time is not enough.
Fasting slowns down metabolism in a big way. Fasting by itself is not the road to normal weight.
You gotta involve exercise.