Jeremy is a smart guy, and I'm sure that he tries his best to mix the practical lifestyle with the non-practical. It's a question of: do I wish to live to be 95, but with a dull healthy life? Or do I live until I'm 75 and die happy knowing that I've nurtured every sensation a man been inspired to have? Yes that was a Devil's Advocate movie reference.
Personally I'd like to be somewhere in between - my belief is that life is to be enjoyed, and its memorable moments savoured, but not to such a point that after a certain decade, say, 50, it all just goes completely downhill. Plus it depends on the environment - in America's suburbs all we can do for fun is drink and eat, whereas in a city like Chicago it's quite pleasant and rewarding to walk around, whether to a bar, nightclub, clothes shopping, beach, work, friend's condo and so on. I'm stuck in suburbia, and I have to make up for it by eating salmon, brown rice, vegetables and work out. Only on weekends can I eat/drink what I feel like and it's been going all right. I don't smoke, I seldom drink, and at the age of 31 I'm in a best shape since 2000.
As for Clarkson, well I'm certain he's got his own compass not just on morals, but also mortality.