{"id":34015,"date":"2026-07-17T17:34:31","date_gmt":"2026-07-17T21:34:31","guid":{"rendered":"https:\/\/therapytoronto.ca\/news\/?p=34015"},"modified":"2026-07-17T17:34:31","modified_gmt":"2026-07-17T21:34:31","slug":"heavy-tv-watching-associated-with-smaller-brain-structures-study-finds","status":"publish","type":"post","link":"https:\/\/therapytoronto.ca\/news\/2026\/07\/heavy-tv-watching-associated-with-smaller-brain-structures-study-finds\/","title":{"rendered":"Heavy TV watching associated with smaller brain structures, study finds"},"content":{"rendered":"
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Reduced volume was found in areas of the brain connected to memory formation, indicating a potential link between TV watching and higher dementia risk<\/p>\n

Peer-Reviewed Publication<\/a><\/p>\n

UNIVERSITY OF SOUTHERN CALIFORNIA<\/p>\n

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\u201cTurn off that TV, it\u2019ll rot your brain!\u201d has been a household refrain for decades. While \u201crot\u201d might be too strong a term, researchers are finding that the overall sentiment could have some merit.<\/p>\n

A study<\/a> published recently in Alzheimer\u2019s and Dementia: Journal of the Alzheimer\u2019s Association<\/em>revealed that those who reported watching TV \u201cvery often\u201d in midlife later exhibited reduced volume in areas of the brain associated with memory, smaller frontal and occipital lobes, and areas of damage in the brain\u2019s white matter that are associated with aging, stroke risk, cognitive decline and dementia.<\/p>\n

\u201cFor years we\u2019ve focused on how much people sit. Our findings suggest we should also pay attention to what they\u2019re doing while they\u2019re sitting,\u201d says David Raichlen<\/a>, professor of biological sciences<\/a> and anthropology<\/a> at the USC Dornsife College of Letters, Arts and Sciences and a senior author of the study.<\/p>\n

The findings weren\u2019t just due to TV viewing\u2019s sedentary nature. The study found that other types of sedentary activities did not have the same associations, indicating that what one does while sitting may matter much more than previously thought.<\/p>\n

Watching changes<\/h2>\n

The researchers analyzed data from about 1,700 adults, average age 53, who enrolled in the Atherosclerosis Risk in Communities<\/a> (ARIC) Study between 1987 and 1989. ARIC is a long-running study of the U.S. population designed to investigate cardiovascular and brain health.<\/p>\n

Participants were asked how frequently, on a scale ranging from \u201cnever\/seldom\u201d to \u201cvery often,\u201d they watched television during their leisure time and how much of their workday they spent sitting.<\/p>\n

More than two decades later, participants underwent brain MRI. Compared with people who reported \u201cnever\u201d or \u201cseldom\u201d watching TV, those who watched TV \u201cvery often\u201d showed widespread structural differences across the brain.<\/p>\n

The researchers found smaller volumes in areas associated with early signs of Alzheimer\u2019s disease and more white matter hyperintensity volumes, an indicator of cerebral small blood vessel disease associated with cognitive decline and dementia. These participants also had smaller occipital and frontal lobes, regions associated with visual processing and executive functioning.<\/p>\n

Differences persisted even when the researchers controlled for factors such as physical activity, diabetes, body mass index, smoking, and alcohol use.<\/p>\n

Of note, the researchers relied on self-reported data for TV consumption, which can be less precise than timed tracking. Study participants also did not undergo a baseline MRI. Future research could begin with a baseline MRI to more concretely demonstrate changes over time.<\/p>\n

Not all sitting is made the same<\/h2>\n

Strikingly, the sedentary element of TV watching didn\u2019t appear to be the main driver for these changes.<\/p>\n

Those who reported high amounts of sitting at work actually had larger frontal and occipital lobes, as well as reduced white matter hyperintensity volumes, indicating better brain health than among those who sit to watch TV. This could be due to the intellectually stimulating nature of many sit-down jobs, say the study authors.<\/p>\n

Men appeared to be particularly vulnerable to these changes. When the MRI scans were separated by sex, researchers found that most of the changes to the brain, both from TV watching and occupational sitting, were seen in men.<\/p>\n

Such findings indicate there is still more research to be done on this complex topic. However, we might eventually see a different approach to health guidance around sedentary activities. Rather than just directing their patients to move more, for example, physicians might recommend they reduce television time and add cognitively engaging activities for when they do sit.<\/p>\n

\u201cWe frequently encourage the public not to spend too much time sitting down, but experts may want to expand that recommendation to encompass the activities done while sitting, since those seems to have distinct impacts on brain health,\u201d says study corresponding author Natan Feter<\/a>, postdoctoral scholar in the Human and Evolutionary Biology program<\/a> at USC Dornsife.<\/p>\n

About this study<\/h2>\n

In addition to Raichlen and Feter, study authors include Anamika Nanda, Mark Lai, Rand Wilcox and Sarah Hourihan of USC Dornsife; Daniel Aslan of Harvard University; Jayne Feter of Universidade Federal do Rio Grande do Sul; M. Katherine Sayre of University of California Santa Barbara; Pradyumna Bharadwaj, Madeline Ally, Hyun Son, Yann Klimentidis, Amit Arora and Gene Alexander of the University of Arizona; Silvio Maltagliati of USC Dornsife and Universit\u00e9 Bretagne Sud.<\/p>\n

This research was supported by National Institutes of Health grants P30AG072980, P30AG019610, R56AG067200, R01AG064587, and R01AG072445 and funding from the state of Arizona, the Arizona Department of Health Services and the McKnight Brain Research Foundation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Reduced volume was found in areas of the brain connected to memory formation, indicating a potential link between TV watching and higher dementia risk Peer-Reviewed Publication UNIVERSITY OF SOUTHERN CALIFORNIA FacebookXLinkedInWeChatBlueskyMessageWhatsAppEmail \u201cTurn off that TV, it\u2019ll rot your brain!\u201d has been a household refrain for decades. While \u201crot\u201d might be too strong a term, researchers… <\/p>\n","protected":false},"author":3,"featured_media":14654,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[6,9,332,347],"tags":[42,160,49,363],"class_list":["post-34015","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neuroscience","category-parenting","category-psychotherapy-2","category-substance-abuse-2","tag-brain","tag-developmental","tag-mental-health","tag-perception"],"_links":{"self":[{"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/posts\/34015","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/comments?post=34015"}],"version-history":[{"count":1,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/posts\/34015\/revisions"}],"predecessor-version":[{"id":34018,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/posts\/34015\/revisions\/34018"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/media\/14654"}],"wp:attachment":[{"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/media?parent=34015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/categories?post=34015"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/therapytoronto.ca\/news\/wp-json\/wp\/v2\/tags?post=34015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}