Mental activity through reading or crossword puzzles may stall onset of Alzheimer’s, but once dementia sets in, there is no stopping it. If anything the decline in mental faculties is faster in those who have been active earlier.
US researchers who followed more than 1,000 people to find out how helpful mental activities are in keeping at bay debilitating diseases, and the results are mixed.
The team from the Rush University Medical Center in Chicago recruited 1,157 people aged over 65 in the early 1990s.
They were given a maximum of five points based on how often they engaged in a variety of activities which involved processing information, including listening to the radio or watching TV, reading a book, carrying out a crossword puzzle or jigsaw, or going to a museum.
They were then followed for an average of 12 years, with assessments every three years.
For each additional point those without a diagnosed cognitive impairment saw a 50% slower decline in their brain function, which was examined through a variety of tests.
But the 148 people who had a diagnosis of Alzheimer's saw a 42% faster decline for each point they had accumulated for mental activity.
Cognitive activity enhances the brain's ability to maintain normal function as disease develops, allowing the mind to tolerate significant pathological changes without compromising its performance.
But when Alzheimer's is finally diagnosed, the disease appears to be at a more advanced stage.