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Regular consumption of coffee and tea may do more than boost alertness—it could also play a role in maintaining cognitive health over time. This is suggested by findings from a large-scale analysis of more than 130,000 participants followed over a period of 43 years.

Throughout the study, participants regularly reported their dietary habits, health status, and changes in memory and thinking abilities. Over the course of the observation period, more than 11,000 individuals developed dementia. The analysis found that those who consumed caffeinated coffee in moderate amounts—about two to three cups per day—had an approximately 18% lower risk of developing dementia compared to those who rarely or never drank it. They also reported fewer subjective memory complaints and performed better on certain cognitive tests.

Similar patterns were observed among tea drinkers, with one to two cups per day associated with favorable outcomes. In contrast, decaffeinated coffee did not show a clear association with improved cognitive measures, suggesting that caffeine may play an important role in the observed effects.

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Researchers link these findings to compounds found in coffee and tea, including caffeine and polyphenols, which are believed to help reduce inflammation and protect brain cells from damage. Higher levels of caffeine intake did not appear to have harmful effects in this analysis, showing results comparable to moderate consumption.

Further analysis indicated that the association between caffeine intake and cognitive health was consistent regardless of genetic predisposition to dementia, highlighting the potential influence of lifestyle factors. At the same time, researchers emphasize that coffee and tea consumption represents only one part of a broader picture that includes diet, physical activity, sleep, and overall health.

The findings suggest that moderate, regular consumption of coffee or tea may contribute to maintaining cognitive function with age, though it should not be viewed as a standalone solution for preventing dementia.

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