Broke my leg

Hey everyone. I broke my leg and I’ve been out of commission for going on 3 months now. I’m a very active person but since I couldn’t walk for 2 months and only just got my cast off less than a week ago, I’ve noticed I’ve gained a little weight in my stomach. I also have lost a TON of muscle. Does anyone have any recommendations on pills, supplements, etc that helps lose belly weight or just overall? I don’t know when I’ll be allowed to exercise. Thank you!