An extensive study following over 130,000 individuals over 40 years has identified a correlation between regular caffeine intake and a reduction in dementia risk.
Conducted by Harvard researchers, the study discovered that those who consumed the most coffee experienced an 18% lower likelihood of developing dementia compared to those who seldom drank it.
Similarly, avid tea drinkers at the highest consumption levels enjoyed a 16% decrease in their dementia risk.
This protective effect is attributed to caffeine’s ability to combat inflammation and prevent the accumulation of detrimental proteins in the brain, which are factors known to contribute to cognitive decline.
Decaf fails to deliver
However, those seeking benefits from decaffeinated versions will be let down, as the study found no protective advantages from caffeine-free coffee or tea.
This finding affirms that caffeine itself is responsible for the protective effects, rather than other components in these beverages.
Healthcare workers formed the basis of the investigation, with scientists monitoring their intake of caffeinated products from coffee, tea, fizzy drinks and chocolate.
Beyond just lowering disease risk, higher caffeine consumption correlated with better overall brain performance and slower rates of cognitive decline.
Moderation proves optimal
The research revealed an unexpected twist – moderate consumption produced the strongest protective effects, with no extra gains for people drinking larger quantities.
Lead researcher Yu Zhang, a Harvard Chan School PhD student, explained: “Caffeine is likely equally beneficial for people with high and low genetic risk of developing dementia.”
Senior researcher Dr Daniel Wang from Mass General Brigham’s Department of Medicine noted: “While our results are encouraging, it’s important to remember that the effect size is small and there are lots of important ways to protect cognitive function as we age.”
Study limitations acknowledged
Dementia developed in 11,033 people during the 43-year tracking period.
Professor Tara Spires-Jones from the UK Dementia Research Institute, who did not participate in the research, cautioned:
“This kind of observational research cannot prove conclusively that caffeine intake was the reason for lower dementia risk.”
