This is what i'd suggest.It seems easier to bring it up to the wife to me. Only because you don't run the same risk of ruining a friendship but I also think it would force her to tell her husband because she is going to be scared that you guys will get to him first.
If it could come from her it would be much better than coming from you.
@brokenhearts As a good friend of a dude thats a good guy you have to tell him, so before you do get in contact with the wife and let her know she need to speak to your homie before you do.

really tried to argue with me over the health merits


