Nutrition and hydration are vital for healing. Vital. He should not be thinking "I'll just lose weight I can afford to lose some, I'll just get it back later" as many of us do. It doesn't work that weay, and makes your recovery much longer. The experienced folks here will harp on about it, because its true.

My mum has degenerative arthritis right now too. Her husband is under chemo for lung cancer, her daughter is recovering from chemo and a masectomy and her son, me, is dealing with SCC! Every journey is different and you're on a tough road. I hope you are getting the support you need and if there is anything we can do to assist, please ask.