Exercise keeps the brain from shrinking as we age : TreeHugger

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The authors conclude that “these results provide meta-analytic evidence for exercise-induced volumetric retention in the left hippocampus. Aerobic exercise interventions may be useful for preventing age-related hippocampal deterioration and maintaining neuronal health.” Or to put it another way, if you’re looking to keep your brain big and healthy, exercise could be your silver bullet.

See the study here: Effect of aerobic exercise on hippocampal volume in humans: A systematic review and meta-analysis.