When my RAH drastically reduced his alcohol intake - his health deteriorated terribly. During that time he did not look after himself as well as he should have. Over the months it got worse and worse and we have ended up separated as a result.
As I have told him since ... I am not in the habit of chasing a grown man round the house trying to ensure he eats properly, visits the Dr, gets medical care and uses it properly, and takes his thiamin and other vitamins. It is a shame because, for many months he was clearly trying very hard to fight his desire to drink, but was fighting a losing battle with his health.
In my experience, alcohol abuse brings a whole host of other health problems and it is very hard for the onlooker to determine what the specific causes are. In the end it all boils down to poor health care and physical delapidation from too many empty calories coming from alcoholic drinks. The RAH has to learn to look after themself just as the recovering codependent does.
Active alcoholics are a whole different ball game though.