Tell him it can't be a woman's liver 'cause women don't eat like that! LOL! Despite the assorted problems, I know it must feel good to have your man back.
As far as kidney function, poor function will show up as elevated creatinine and low BUN (blood urea-nitrogen.) There will also be scant urine and perhaps it will be dark or concentrated. If he is not on fluid restriction, make sure he is drinking enough fluids. He can also get fluids through fruit. If he is on diuretics, make sure his potassium doesn't get too low.
Hugs,
Connie