Rx, it's water weight...maybe 1 lb at the most. Don't stress. Just eat a little lighter for a few days and you'll be back to your normal self. I don't think you should worry, ok?

I've only gained in IP once. I usually eat next to nothing. However, I did gain 15 lbs at a nice IP residential place during a six month stay. It wasn't hospital food. I cannot eat hospital food. I drink juice, which I dislike. I give my food away instead. It's a problem for me but I don't plan on returning to the hospital ever again.