In a study published in the Journal of the American Medical Association, researchers asked 2,257 men ages 71–93 and with no signs of dementia how far they walked each day.
Cognitive assessments performed four to eight years later showed that the men who walked less than a quarter mile a day were nearly twice as likely to have developed dementia as those who walked two miles or more each. day.
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Original content Bob DeMarco, the Alzheimer's Reading Room