USC Study Links Frequent Midlife TV Viewing in 1,700 Adults to Smaller Brains
Updated
Updated · ScienceDaily · Jul 22
USC Study Links Frequent Midlife TV Viewing in 1,700 Adults to Smaller Brains
3 articles · Updated · ScienceDaily · Jul 22
Summary
About 1,700 adults who reported watching TV “very often” in midlife showed, more than 20 years later, smaller brain regions tied to memory plus more white matter damage on MRI scans.
Those links held after accounting for physical activity, diabetes, body mass index, smoking and alcohol use, suggesting passive TV viewing—not inactivity alone—may drive the pattern.
Workday sitting showed the opposite association: participants with more seated jobs had larger frontal and occipital lobes and lower white matter hyperintensity volumes, consistent with healthier brain patterns.
Men showed most of the observed TV- and sitting-related brain differences, while the authors cautioned that self-reported viewing habits and the lack of baseline MRI scans limit causal conclusions.
The findings suggest future advice may shift from simply telling people to sit less toward cutting television time and choosing more mentally engaging seated activities.