I agree with elephant, while it may seem futile, I think trying to keep it off is worthwhile. I think the most important thing is to keep eating the quantity of food you were eating before starting prednisone, even if you're hungry. I was hungry all the time on prednisone and I ate and ate and I gained a lot more thann 10 pounds. The weight didn't come on while I was on 40mg either, it crept up while I was tapering, slowly, I didn't even realize how much I gained or how difficult it would be to lose this weight. I was able to lose it but not until I got under 4mg of prednisone. While on prednisone, I stopped trying to keep weight off and I think it was a mistake. I seriously ate all the time. I heard lowering salt intake can help a bit.
What medications are you currently takng? Is your signature up to date? Just Asacol? What dose per day?