probably not as much as doing anything non sedentary

>Strikingly, the sedentary element of TV watching didn’t appear to be the main driver for these changes.

>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.