Scientists from the University of Essex and the University of Cambridge, UK, also participated in the research. They studied 36 participants over 60 years old.
To assess the participants' cognitive functions, researchers subjected them to neuropsychological tests and magnetic resonance imaging (MRI) to examine their brain structure.
Researchers found that participants who drank tea at least four times a week for at least two decades had improved brain functions, which also protected against age-related cognitive decline.
There are three key ingredients in tea attributed to these health benefits – catechin, L-theanine, and caffeine.
According to the study, catechin is linked to "improvements in memory recognition and working memory performance," and L-theanine can reduce "stress-induced heart rates." The caffeine levels in tea have long been valued for improved cognitive function, too.
Previous studies have also revealed that tea can lower the risk of cancer, cardiovascular disease, reduce mortality, and lower stress levels.






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