Memory loss is the single biggest fear for Americans over the age of 55. And it's understandable: over 4 million currently suffer from Alzheimer's disease, and those numbers are expected to quadruple by 2050, according to the Alzheimer's Foundation. That may be why memory-boosting products like Sudoku puzzles and ginko-infused soft drinks are lining storefronts. But beyond the marketing campaigns, there's one common practice that's been proven to preserve memory: exercise. Just walking six miles a week can increase the growth of new cells and improve cellular processes associated with learning and memory.
