"Adults aged 60 and older who sit for long periods watching TV or other such passive, sedentary behaviors may be at increased risk of developing dementia, accor

"Adults aged 60 and older who sit for long periods watching TV or other such passive, sedentary behaviors may be at increased risk of developing dementia, according to a new study by USC and University of Arizona researchers. Their study also showed that the risk is lower for those who are active while sitting, such as when they read or use computers." People in the former group probably have lower IQ and could already be undergoing cognitive decline. One could do a study where the treatment group is told to avoid watching TV in favor of more mentally stimulating activities and see if it makes a difference.