How to avoid Truncal Weight Gain while on Prednisone for life?

I'm 20 and on prednisone for the rest of my life to treat my autoimmune disease (no there's no other alternative drug I could be on) . I am currently on a high dose 50mg every other day and i've been on this for 9 months. My specialist will try to get my dose lowered but it may not be possible. Anyways, is there a way I can avoid Truncal weight gain while taking this medication? I've watched what I ate since taking this and I have maintained and lost weight in the last 9 months but I'm still terrified of truncal weight gain and looking deformed. Any tips are appreciated.