Neurology shows that walking at least 72 blocks a week, or six to nine miles, leads to greater volumes of grey matter--and less memory loss--over time. About 40 percent of study participants developed some form of dementia over the course of the study, but those who had more grey matter because of walking reduced their risk of cognitive impairment by two-fold.
So at least now we have some evidence that creating pedestrian-friendly environments is important for public health.
A longitudinal study of older adults (average age 78) released this month in the journal Tuesday, October 19, 2010
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