When decreasing from 60mg to 5mg of prednisone the side effects also decrease. So as you stop wanting to eat everything on the planet, the excess fluid is disappearing, and the moon face shrinks you will lose the weight. However you may not get to your pre-prednisone weight while maintaining 5mg but you can get very close.
When I was 15 yrs old taking 60mg I could NOT stop eatting and went from 103 lbs to 144lbs in 5 weeks!!! I did lose most of the weight when I was able to cut down to 10mg a day. It took me 5 months and alot of exercising because when I was on the 60mg I was eatting 24/7. Good Luck