I don't think she's worried ... I got that as her making a joke.

> He writes that his wife is worried for his liver

lol no! you lost something in translation...

I'm French. She says it because of the wine, but maybe it has to do with his illness? Maybe not...

It reads to me as a dark joke by repeating a common caution that is now completely irrelevant. Note the "Je ris" ("I laughed" for the non-French speakers) immediately afterwards. I'm presuming that's what kome think you missed.

It's meant as a joke. As a wife who is worried about his health, although irrelevant in his current state, continues to pretend having a normal life.

Such sentence is very common in my (Belgian) entourage.

This is also why he adds he is smiling.

Yeah, I totally missed the sarcastic tone. I just thought she was making the joke on his actual illness, not the possibility of having another illness due to wine abuse.

Alcohol has been linked to pancreatic cancer