I also think city life is much less healthy, what with all the waves radiating from wireless items like cell phones and Bluetooth, smog, gross water (tap water in the country is so much better than city tap, I can't even explain the difference), garbage... the country is so CLEAN. The sky is so expansive and the hills so extensive that I couldn't imagine such a thing as disease. The only people I know in my hometown with sicknesses smoke, color their hair, and eat too much aspartame. The people who grow their own vegetables and sit outside during the evenings are pretty healthy, as far as I can see.
Work may be more difficult if you live in the country - things get pretty dirty, and there's probably more yardwork (we have a big yard with bushes and trees and roses and more). You also have to look out for mountain lions and coyotes where I live... though I guess you have to battle traffic and other such things in the city.