Sedentary behavior that involves mental engagement may play an important role in preventing dementia, according to a study published in the American Journal of Preventive Medicine (AJPM).

Researchers found that not all forms of sitting have the same impact on brain health. Activities such as reading, working on a computer, or doing puzzles—despite being sedentary—can help maintain cognitive function and are associated with a lower risk of developing dementia.

In contrast, passive sedentary behaviors, such as prolonged television watching, were linked to a higher risk of cognitive decline. Scientists suggest that the key factor is the level of mental stimulation during these activities.

The study highlights that even for people who spend a lot of time sitting, engaging the brain through intellectually stimulating tasks may help offset some of the negative effects associated with a sedentary lifestyle.

The authors emphasize that dementia prevention strategies should take into account not only physical activity levels but also the quality of sedentary time. Encouraging mentally active habits could become an important component of public health recommendations aimed at reducing the risk of cognitive disorders.