TV time may shrink brain and increase dementia risk: study

Key Points:

• A study by the University of Southern California found that excessive TV watching in middle age is linked to brain shrinkage and increased risk of dementia, as detailed in Alzheimer’s and Dementia: Journal of the Alzheimer’s Association.
• Researchers analyzed data from 1,700 middle-aged adults over two decades, revealing that frequent TV viewers had reductions in brain regions associated with Alzheimer's and higher levels of white matter hyper-intensity, a marker of cognitive decline.
• The study showed that TV watching, rather than sedentary behavior alone, was primarily responsible for these negative brain changes, as those sitting for work exhibited better brain health.
• Men appeared to be more affected by TV watching and sedentary work in terms of brain structure changes, according to MRI scans.
• Researchers suggest health guidelines should consider not only the amount of sitting but also the nature of activities performed while sitting, emphasizing the potential harm of passive activities like TV watching.