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A clinical neuropsychologist's three recommendations for brain health — regular exercise, quality sleep, and social connection — are backed by a growing body of research showing that up to 45% of dementia cases may be preventable through lifestyle changes. With 7.2 million Americans living with Alzheimer's and global cases projected to triple by 2050, experts say these accessible interventions could be the most powerful tools available for preserving cognitive function across the lifespan.