New Study Reveals Leisure-Time Exercise Significantly Lowers Dementia Risk, While Occupational Activity May Increase It
A comprehensive meta-analysis of 74 studies, involving over 4.2 million adults, has found that not all physical activity equally protects the brain from dementia. The study, published in The Lancet Public Health and led by researchers at the University of Southern California, indicates that leisure-time physical activity is associated with a 24% lower risk of dementia. Conversely, occupational physical activity was linked to a 20% higher risk. The research examined four domains of physical activity: leisure-time, occupational, household, and active commuting. While leisure-time activities like walking or swimming showed significant benefits, occupational activity, often characterized by repetitive tasks, low autonomy, and insufficient recovery, did not. Household activity showed a 15% lower risk, though this was based on only one study, and active commuting was linked to a 10% higher risk based on two studies. The findings highlight a 'physical activity paradox,' previously observed in cardiovascular resea... 
