Regularly engaging in word puzzles and similar cognitive activities may help slow brain aging and maintain mental acuity, according to recent research. A clinical trial led by the University of Exeter, known as the Protect study, tracked 19,000 individuals aged 50 and older over several years, finding that those who routinely completed puzzles preserved cognitive function comparable to someone approximately eight years younger.
Additional studies from the United States have supported these findings, indicating that consistent puzzling might delay the onset of cognitive decline by several years. Experts describe these activities as akin to exercise for the brain, promoting neurological health through mental stimulation.
Professor Matthew Kiernan, chief executive and director of Neuroscience Research Australia, compares puzzles such as crosswords and sudoku to physical stretching exercises. He emphasizes that even brief periods of daily puzzling—just two minutes a day—can provide meaningful benefits over time. “It could be at the beginning of the day over breakfast, or lying in bed at night,” he says, noting that the key is engaging in regular mental exercise as part of self-care.
The underlying mechanism, Kiernan explains, involves the activation of neurons in the brain. Intellectual stimulation triggers electrical activity between nerve cells, strengthening the connections or "wiring" within the brain. Summarizing this, he says, “Cells that fire together, wire together.” He cites a well-known study of London black cab drivers, who memorized detailed city routes and showed measurable growth in the hippocampus, a region of the brain associated with memory, as a result of their intense learning.
Kiernan suggests that lifelong learning and continuous acquisition of new knowledge can increase the brain’s resilience against atrophy typically associated with aging. Puzzles may contribute to this process by introducing new vocabulary and information, thereby fostering cognitive growth.
Supporting this perspective, Joe Verghese, a professor of neurology at the Renaissance School of Medicine at Stony Brook University in New York, highlights the importance of cognitive challenges during retirement. He notes that while many people engage in mentally stimulating work activities, retirement often leads to a reduction in such stimulation. Puzzles and similar hobbies can fill this gap, helping to sustain cognitive function later in life.
Taken together, these findings suggest that incorporating even a small amount of daily cognitive exercise, such as word puzzles, can have a significant positive impact on brain health as people age.