A study published in Alzheimer’s & Dementia suggests that frequent TV viewing in midlife may be associated with structural brain changes more than 20 years later.
Key facts
- •The study analyzed 1,700 adults with an average age of 53 who enrolled in the ARIC study between 1987 and 1989.
- •Brain MRIs were conducted on participants more than 20 years after their initial midlife assessments.
- •High amounts of sitting during work were associated with better brain health outcomes compared to high amounts of sitting while watching TV.
- •Researchers suggest that TV viewing may be accompanied by other factors like snacking or reduced social interaction.
- •The study recommends replacing passive leisure time with cognitively or socially engaging activities to support healthy aging.
A study published July 10 in the journal Alzheimer’s & Dementia found that adults who reported watching TV “very often” during midlife showed reduced brain volume and other structural differences over two decades later. Researchers analyzed data from 1,700 participants who were part of the Atherosclerosis Risk in Communities (ARIC) Study. The findings indicate that these brain changes may be linked to cognitive decline and aging, though the study identifies an association rather than a direct cause-and-effect relationship.
By the numbers
Brain Structure Findings
Participants who frequently watched TV showed smaller volumes in brain regions associated with memory and early signs of Alzheimer’s disease. Researchers also observed greater white matter hyperintensity, an indicator of small blood vessel disease, as well as smaller frontal and occipital lobes, which are involved in executive functioning and visual processing.
Sedentary Behavior and Cognitive Engagement
The study suggests that the type of sedentary activity matters, as individuals who sat frequently for work did not show the same negative brain changes. Researchers noted that TV viewing is often cognitively passive, whereas work-related sitting may involve different levels of mental engagement. Study author Natan Feter suggested that replacing passive TV time with mentally stimulating activities like reading, writing, or puzzles may support brain health.
Demographic Variations
When analyzing the data by sex, researchers found that the associations between heavy TV viewing and lower brain volumes were observed primarily in males. While the study highlights these trends, experts emphasize that smaller brain volumes do not guarantee the development of dementia but serve as markers for potential future cognitive decline.
Advertisement
This article was independently rewritten by ManyPress editorial AI from reporting originally published by Healthline.
