A systematic review of 85 studies found that active sitting—like reading or playing cards—supports cognitive health, while passive sitting, such as watching TV, correlates with negative outcomes like increased dementia risk. The research, led by Paul Gardiner at the University of Queensland, published in the *Journal of Alzheimer's Disease*, differentiates sedentary behaviors for the first time.

Most public health guidelines treat all sitting as equally harmful, but this study argues for nuance. Engaging the brain during sedentary time may protect executive function and working memory. The findings suggest that small daily choices, like swapping TV for a book, could offer practical, low-effort strategies to maintain long-term cognitive resilience.

While exercise remains critical, the review highlights that mental stimulation while seated also matters. Researchers hope this distinction will inform future health guidance, encouraging more mentally active sedentary behaviors. The next step involves translating these insights into public health recommendations that move beyond simply 'sit less' to promote smarter sitting habits.