We have seen many articles on the benefits of exercise. Here is the other extreme.
neurosciencenews.com/dement....
Summary: Adults over 60, who engage in more than 10 hours of sedentary behavior daily, have a heightened risk of dementia. The study revealed that the pattern of sedentary behavior throughout the day mattered less than the total hours spent. Using objective accelerometer data from over 50,000 participants of the U.K. Biobank, the findings after six years pinpointed 414 dementia cases. Importantly, sitting times below 10 hours daily did not indicate increased risk.