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Does Watching TV Increase Dementia Risk?
Does Watching TV Increase Dementia Risk?
By Robert Heyward
New research from the University of South Australia (UniSA) sheds light on the relationship between sedentary activities and cognitive health, revealing that the type of sedentary behaviour plays a significant role in maintaining brain function.
The study, which assessed the 24-hour activity patterns of 397 older adults aged 60 and above, underscores that not all sitting activities are equal when it comes to protecting cognitive abilities.
Which Activities Benefit Brain Health?
The findings reveal that sedentary activities involving mental stimulation or social engagement — such as reading, crafting, listening to music, praying, playing a musical instrument, or chatting with others — are beneficial for memory and thinking skills.
In contrast, passive behaviours like watching television or playing video games were found to have a detrimental effect on cognitive health.
According to researchers, there appears to be a hierarchy in how different sedentary activities impact the brain. Some activities support cognitive function, while others may increase the risk of decline. This insight is crucial, especially since approximately 45% of dementia cases are potentially preventable through modifiable lifestyle factors.
Why Context Matters
Dr. Maddison Mellow, a UniSA researcher, emphasised the importance of understanding the context of sedentary behaviours.
“We discovered that the context of an activity significantly influences how it relates to cognitive function. Activities that encourage mental stimulation or social interaction, such as reading or conversing with friends, are far more beneficial than passive activities like TV watching or gaming.”
While physical activity remains a top recommendation for reducing dementia risk, Dr. Mellow highlighted that even swapping one sedentary activity for a more engaging one could improve brain health.
“Our findings suggest a need for a more nuanced approach. For brain health, the message isn’t just about ‘moving more and sitting less’ — it’s about choosing activities that engage the mind and foster connection.”
How to Support Cognitive Health
Taking care of your brain doesn’t require drastic lifestyle changes. Small, intentional adjustments can have lasting benefits:
- Prioritise enjoyable physical activities: Regular movement that gets the heart rate up is highly protective for both brain and physical health.
- Make time swaps: Replace some passive activities with mentally or socially stimulating ones. For instance, swap an hour of TV for reading, crafting, or talking with a friend.
- Incorporate movement breaks: Even during a movie marathon or a gaming session, break up prolonged sitting with five-minute stretches or short bursts of physical activity.
“Every small change counts,” Dr. Mellow advised. “Even minor shifts, like choosing a book over binge-watching, can build healthier habits over time.”
Building a Cognitive Health Routine
With dementia risks largely influenced by lifestyle choices, integrating stimulating sedentary activities and regular physical movement into daily life can offer powerful protection against cognitive decline.
While it’s clear that physical activity remains the gold standard for brain health, this research highlights a key takeaway: not all sitting is bad, but the type of sedentary activity matters.
By making thoughtful choices in how we spend our time, we can nurture both mind and body, reducing the risk of dementia and fostering long-term well-being.
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