Stacey
What DavidCPA said is so true. Recovery is long and hard regardless. I'm always amazed how oncologists ignore body mass index but then they are just parroting something they have been told rather than recounting any valid studies. Actually the one clinical study I could find did not support the theory that weight loss alone mattered, rather it was reduced food intake after the TX was over. It was for pancreatic cancer however not oral cancer. Many patients are much more than 10% overweight going into TX. If his doctors were right then everybody who goes on a weight loss program is wrong. Of course many doctors are overweight themselves so they are biased. I lost a lot more weight than your husband and I bounced back pretty fast the first time. Just saying.
We can't change the past, so focus on getting your husband the best and most calories and food going forward. That has been shown to be the real factor in recovery, not some old doctors' tales based on arbitrary weight loss percentages. If you can get your husband to eat and exercise, those will determine how fast he recovers. Glad for you that this is almost over
Charm