He'll have to start drinking really very light water (as little deposit as possible, as low in calcium and sodium as you can find)
and give up some "solid food" he may like - he'll have to adapt his regimen and lifestyle.
But he'll be alive, and that's what counts. I still look after the scar on my left jaw that reminds me "I'm alive".
On a lighter note, if you allow me a joke, just to raise the morale, if you're in good terms, tell your friend this punchline:
"Man is like a big sausage, you may have to slice off a sliver, but he'll still be full of baloney!"
If you got the double-meaning and the joke and smiled, I'm happy you did.
If you didn't, and furrowed your brow and thought "HUH ???", then I'm sorry and I hope you didn't take offense.
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For the sake of clarity, in Italy "Baloney" is called "Mortadella", a big, huge boiled sausage
It is typical of the city of Bologna, which is why you call it "Baloney".