11 Hrs
Source:
البلاد
42 Minutes of Daylight
A study of 87,577 adults followed for an average of 8.1 years found that exposure to bright daylight for less than 42 minutes a day was associated with higher odds of dementia and was a stronger indicator than six known risk factors. By contrast, exposure to light levels above 1,000 lux was associated with a 16% lower risk of dementia, with further reductions among those who spent more time in brighter light. The study found no significant association between nighttime light and dementia, but it does not prove that daylight exposure prevents dementia.
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