There have been many articles (some quoted here) that show excess screen time in children (more than 1 hour a day) is associated with lower results in intelligence and poor behavior.
Now a publication (Scientific Reports volume 9, Article number: 2851 (2019) ) has shown an association between TV watching and risk of dementia or Alzheimer's. Following 3600 adults over 50, they found that those who watched 3.5 or more hours of TV daily (as opposed to less than 2.5) had an over 20% decrease in tests of verbal cognition. It was a linear response, those with 7 hours a day had a 50% worsening compared with the lower volume. The authors wonder if this is related to lack of mental stimulation (which has been shown to improve cognition. So turn it off!
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