Exercise, and even walking, might improve the brain health and lower the risk of Alzheimer’s disease in older adults. In a recent study published in the Journal of Neuroscience, researchers compared the health of microglia cells in active and less active adults in their eighties. These are the immune cells of the brain and central nervous system that play a role in brain inflammation. The people with the more active lifestyles proved to have healthier brains and were less likely to show signs of Alzheimer’s disease. But interestingly, they also found that prolonged exercise wasn’t necessary to keep the brains healthy. The people who simply walked more regularly had the same brain benefits.