I too am on Prednisolone 10 mg because I am on Abiraterone 1000 mg daily. I too have a ravenous appetite, but apart from trying to cut down a bit on my carbs, I am doing nothing. I used to walk for over 3 miles everyday which I had to give up because of extreme fatigue post radiation. I re-commenced walking 10 days back and 5 days ago I slipped and have had an ankle injury. So, back to no exercises and just hogging and keeping as happy as I can!!!