A new study involving more than 87,000 adults has found that higher daytime exposure to bright light is associated with a 16 percent lower risk of dementia, with longer periods of exposure linked to even greater reductions in risk. Researchers reporting the findings said the results suggest that increasing daily daylight could offer a surprisingly powerful benefit for brain health. The study adds to a growing body of evidence examining how environmental and lifestyle factors influence cognitive decline in aging populations.
Perhaps most notably, the analysis found that receiving less than 42 minutes of bright daylight per day was a stronger predictor of dementia than six established risk factors, underscoring the potential importance of routine light exposure. The findings do not establish a causal relationship between daylight and dementia risk, and researchers caution that further study is needed to understand the mechanisms involved. Still, the results may inform public health guidance on daily outdoor activity and light exposure, particularly for older adults at elevated risk of cognitive impairment.
Independent reporting synthesized from primary wires and global correspondents.