University of California-Irvine researchers may have discovered one of the ways exercise slows brain changes found in the progression of Alzheimer’s disease! Mice that spent more time running wheels developed fewer plaque forming beta-amyloid protein fragments in their brains than sedentary mice. The scientists hope more research will show whether the same effect occurs in humans. New studies are already under way. The study also found that long-term exercise increased the rate of learning in the mice studied.