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Wellness

Less than 42 minutes of bright daylight linked to higher dementia risk

A study of over 87,000 adults found that low daytime light exposure increases dementia risk more than six known factors.

Oct 29, 2026, 5:11 PM By the Genius Eye newsroom (Wellness Reporter) · Fact-checkedHow we report
Photo: Kalyan Kumar / CC BY-SA 2.0, via Wikimedia Commons

A recent study involving more than 87,000 adults found that exposure to bright daylight is associated with brain health benefits, according to ScienceDaily Health.

The research showed that individuals with higher daytime light exposure had a 16% lower risk of developing dementia compared to those with less exposure.

Longer periods of bright light exposure were linked to even greater reductions in dementia risk.

Notably, getting less than 42 minutes of bright daylight daily was a stronger predictor of dementia risk than six other established risk factors.

These findings suggest that increasing daily exposure to bright daylight could be an important factor in dementia prevention.

Sources
  1. ScienceDaily Health: Less than 42 minutes of bright daylight linked to higher dementia risk
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