Regular physical activity lowers dementia risk by 25 percent, according to a study of millions published in PLOS One.
Exercise shows strongest link to reduced dementia risk
People who met recommended exercise levels had a 25 percent lower chance of developing dementia compared to inactive peers. The benefit likely stems from improved cardiovascular health and reduced chronic inflammation. Researchers noted exercise alone cannot fully offset the harms of prolonged sitting.
Sleep duration and sitting time as well affect brain health
Both too little sleep (under 7 hours) and too much sleep (over 8 hours) were tied to higher dementia risk versus 7–8 hours nightly. Extended sedentary periods increased risk, underscoring the need to break up sitting throughout the day. The study emphasized adopting these habits in midlife for optimal protection.
What counts as regular exercise in the study?
The study defined regular exercise as meeting established public health guidelines, though it did not specify exact minutes or intensity levels in the reported findings.
Can exercise undo the damage from sitting all day?
No, the research indicates physical activity is crucial but cannot fully counteract the negative effects of prolonged inactivity. Breaking up sitting time remains important independently.
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