Study Warns: Afternoon Activity May Raise Dementia Risk by 45%

U.S. researchers found that older adults whose peak activity occurs in the afternoon are at higher risk of dementia, as delayed activity disrupts the brain’s biological clock.

  Wed , January 07 2026 / 08:46 PM Updated At: 2026-01-07 20:46:20

رسم توضيحي لارتباط النشاط اليومي بمخاطر الخرف لدى كبار السن

A recent study from University of Texas Southwestern highlights the link between daily activity timing and dementia risk in older adults.

Researchers monitored over 2,000 participants, average age 79, for three years, using devices to track biological rhythms and daily activity over 12 days. Participants were divided into two groups:

  • Strong biological rhythm group, with clear distinctions between active and rest periods.

  • Weak biological rhythm group.

Results revealed that those whose peak activity occurred after 2:15 PM were 45% more likely to develop dementia compared to those peaking earlier.

Experts explained that late afternoon activity may interfere with the body’s circadian rhythm, hindering the removal of toxic proteins in the brain, which are believed to contribute to memory decline. Additional risk factors include genetics, brain changes, poor nutrition, smoking, and physical inactivity, but circadian disruption emerged as a key indicator

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