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Story summary
- U.S. researchers at USC reported leisure exercise lowers dementia risk while occupational activity raises it.
- The Lancet Public Health meta-analysis combined 74 cohort and case-control studies covering 4.2 million people.
- Leisure-time exercise cut overall dementia risk by 24 % compared with the least active participants.
- Occupational physical activity increased dementia risk by 20 % relative to low-activity workers.
- Researchers urged better leisure-time facilities and reduced workplace hazards to protect brain health.
