The researchers used data from the British Biobank. They reviewed information on more than 145,000 participants aged 60 and over. None of them were diagnosed with dementia at the start of the study. These people themselves said what kind of life they lead.
On average, 3,507 participants developed dementia after approximately 12 years of follow-up. It turns out that even in physically active people, time spent watching TV is associated with an increased risk of dementia. But leisure time at the computer, on the contrary, was associated with a reduced risk of developing dementia.