July 2, 2011 
In a paper published in the Proceedings of the National Academy of Sciences, researchers reported that they observed a roughly 2% increase in hippocampus volume for people between the ages of 55-80 who walked for 40 minutes three times a week for a year.
Why do you care? The hippocampus is the brain region critical to long-term memory.
Another point from the study – those who did aerobic exercise also had higher levels of proteins to help build new neurons.
More research is starting to suggest that exercise earlier in life could act as a protective barrier against disease and brain atrophy later in life. It’s in your brain’s best interest to start the exercise habit early. [Kirk Erickson, coauthor of the paper and professor at the University of Pittsburgh – from Experience Life magazine]
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