+1 for MJ's comment. You *can't* cure stupid.
The guy came in out of idle curiosity, not real concern. And Denial is an especially common disease among men, as well as the #1 sign of a male with an MI.
Having said that, don't forget that this guy 'may live there'. His individual physiology may be such, that if you were to quickly lower his BP to a normal range, or the same for his BGL, he might actually get symptomatic for hypoglycemia or poor cerebral perfusion. Of course, in the ER the treatment would be over hours or likely he would be admitted for a few days.
I'm not saying he should stay that way; he is indeed a ticking time-bomb. But he probably really does feel fine right now, and doesn't see how or why it would be different. Folks like that only get convinced by a forced trip to the ED, not a voluntary one, I'm sorry to say.
So, how are the colors? Any leaves still on the trees, or all gone? The aspens here have turned gold, but that's about all we get. We miss the New England fall colors.