With prednisone, you're fighting a seriously uphill battle. You *will* gain an maintain weight as long as you're on it, unfortunately, so some amount of acceptance is required until you're able to start being more active (and hopefully lower or omit prednisone from your regimen). That said, eating very clean will help to minimize fat gain as well as to help your body get into its healthiest condition. Try to keep a lot of fibrous, nutrient dense foods around, and dont even buy sugary, fatty or processed foods if you can help it. Then meals and snacking will help keep you full longer as well as being very nutritious. Drink a lot of water, snack healthy, and don't be too hard on yourself. Your health is most important and for the moment, weight isn't entirely under your control so don't let that be a major concern. Good luck.