No Impact Man posts this interesting graph showing what happens when more of the population walks, cycles, or takes public transit: they are generally skinnier and healthier. Given that the alternatives to driving are all better for the environment, aid in the struggle for energy independence, and delay the impact of peak oil, Why do our planners and elected representatives even permit low density suburban development? Why do they not insist that everyone have access to good public transit? Why are there not bike lanes everywhere?
We suspect there might be other factors going on here as well, such as diet, (those deep fried mars bars spike the UK obesity rate) but it is interesting nonetheless. ::No Impact Man