Excessive time spent sitting can undermine both physical wellbeing and mental wellbeing. Yet one form of sedentary behaviour may be less harmful to the brain - and could even be beneficial - compared with others.
A systematic review drawing on 85 studies suggests it is useful to distinguish between active sitting (for example, reading or playing card games) and passive sitting (such as watching television). The evidence indicates that the former may support brain health in a way the latter does not.
Active sitting vs passive sitting for brain health and cognitive health
The difference may come down to mental engagement: active sitting tends to involve effortful thinking, while passive sitting allows someone to disengage both physically and cognitively.
Public health researcher Paul Gardiner at the University of Queensland in Australia notes that overall sitting time has been linked with brain outcomes, but sitting is frequently treated as one uniform exposure without accounting for what people are actually doing while seated. As most people sit for many hours each day, the type of sitting may matter. In that context, everyday swaps - like choosing a book over television - could help maintain a healthier brain as people get older.
What the studies found
Across the included research, Gardiner and colleagues report that active seated pursuits - including reading, playing card games, and using a computer - showed overwhelmingly positive links with cognitive health. These associations included improvements in cognitive abilities such as executive function, episodic (situational) memory, and working memory.
By contrast, passive sitting was the category most consistently connected with poorer cognitive outcomes, including a higher risk of dementia.
While the effect sizes were small, they were statistically meaningful. The authors argue that these results could support more refined health research and more nuanced public guidance.
Implications for health advice
Exercise remains crucial for protecting cognition, but “working out” the brain also matters - and it does not always require being on your feet. The review’s authors suggest that recommendations should explicitly recognise the distinction between passively watching television and actively using a computer.
They also propose encouraging short breaks that prompt both mental stimulation and movement. Rather than focusing solely on “sit less”, advice could place more emphasis on choosing mentally engaging seated activities, which may be easier and more realistic to maintain long term - and could potentially lower dementia risk.
Why this review is relevant to everyday life
A key feature of the review is that it concentrated on common sedentary activities in real-world settings, not structured cognitive training programmes. That makes the findings more applicable to daily routines, where small choices accumulate over years.
Practical ways to make sitting more “active”
If you need to sit for work, study, or rest, you can often increase mental engagement without changing your schedule dramatically. Examples include reading, doing puzzles, learning a skill online, writing, playing strategy-based games, or using a computer for tasks that require concentration rather than passive scrolling.
It can also help to plan brief “break points” across the day: standing up to stretch, walking to make a drink, or switching tasks for a few minutes. These simple interruptions can make long seated periods less continuous while keeping the mind engaged.
A note on context and balance
Not all screen time is the same: some computer use is cognitively demanding, while other use is largely passive. Similarly, television can sometimes be mentally stimulating, but on average it is treated in research as a more passive activity. The most practical takeaway is to look at how actively you are thinking while seated, alongside how long you remain sedentary.
The study was published in the Journal of Alzheimer’s Disease.
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