Brain Health

Exercise Triggers a Liver-Brain Axis That Fights Alzheimer's and Sharpens Cognition

Scientists have identified a remarkable chain reaction linking exercise to brain health through the liver. When you exercise, the liver releases an enzyme called GPLD1, which travels to the brain and activates a process that refreshes the blood vessels supplying it. This cerebrovascular rejuvenation appears to sharpen cognition in aging individuals and reduce hallmarks of Alzheimer's disease. The discovery reframes how we think about exercise benefits — rather than acting directly on the brain, physical activity may orchestrate a systemic metabolic response in which the liver plays a starring role. This liver-to-brain signaling pathway, mediated by so-called exerkines, opens new doors for drug targets and lifestyle interventions aimed at preserving brain function as we age.