Interesting point. Of course, not many places, especially in America, are nearly as dense and walkable as NYC. However, this is still a good point to make. Also, anecdotal: I live in Atlanta and walk/bike everywhere I go. Now, we all know that Atlanta is no Manhattan--most other Atlantans think I'm nutso to be getting around the city without a car. I'll walk a mile with groceries in my arms or bike 5 miles to go hang out with friends. I know most people won't do that. So to encourage other non-nutso people, to bike and/or walk, we need to improve the density and walkability of Atlanta (and other cities). But this article suggests that there may be a case of diminishing health returns as density increases. Good to keep in mind. Thanks for sharing!

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