Being diagnosed with something that you know will get worse and potentially kill you, and then STILL doing those things that causes the problems is just stupid. There's no other way to say it. Thankfully he's stopped drinking and he'll of course benefit from that.
You don't have to work out all the time and eat "twigs and berries" to be healthy and take care of your body. Doing things that you know are going to aid to your death, which could possibly be a soon one, is ignorant and irresponsible at best...