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Just 1 Mile Keeps Your Brain from Shrinking

(RealAge.com) Our brains tend to shrink as we age, just like a piece of fruit on the counter. But you could help keep your brain plump and young just by walking about a mile a day…
In a 9-year study, people who walked just 6 to 9 miles each week preserved significantly more gray matter as they aged, compared with their more sedentary peers…
[N]ot only did the walkers have less brain shrinkage, but also that translated into a twofold reduction in their risk for cognitive impairment. What's more, the researchers also looked at the benefits of physical activity in people already suffering from cognitive impairment or Alzheimer's disease and found that a mere 5 miles a week of walking seemed to slow progression of the condition.
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