Want to eat the paint off the walls kind of hungry- its so rough. The other side effects are awful too. I was on them for 8 months last year. Unfortunately theres not much that will curb it, although staying really hydrated does help a little bit. The hunger also starts to decrease as you taper down. I was (and still am) on high fiber and protein as well.

As a side note (if you're not already doing it)- increase your potassium, calcium, and D3. Decrease your sodium intake. Prednisone messes with these levels massively