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Subjects who drank green, oolong, or black tea at least four times a week for about 25 years had more efficiently interconnected brain regions.
Regular consumption of tea may offer a protective effect on brain structure and age-related cognitive decline, according to research published in the scientific journal Aging. The majority of previous tea studies have relied on neuropsychological measures, and much fewer on neuroimaging measures, especially for interregional connections. To date, there has been no exploration of the effect of tea on system-level brain networks, according to study authors. The research, led by Feng Lei from the NUS Yong Loo Lin School of Medicine’s Department of Psychological Medicine, was carried out with collaborators from the University of Essex and University of Cambridge. Researchers recruited healthy older participants to two groups according to their history of tea drinking frequency and investigated both functional and structural networks to reveal the role of tea drinking on brain organization. The study revealed that regular tea drinkers have better organized brain regions—and this is associated with healthy cognitive function—compared to non-tea drinkers. The research team made this discovery after examining neuroimaging data of 36 older adults. Results showed that tea drinking gave rise to the more efficient structural organization, but had no significant beneficial effect on the global functional organization. The suppression of hemispheric asymmetry in the structural connectivity network was observed as a result of tea drinking. “Our results offer the first evidence of positive contribution of tea drinking to brain structure, and suggest that drinking tea regularly has a protective effect against age-related decline in brain organization,” said Lei. Previous studies have demonstrated that tea intake is beneficial to human health, and the positive effects include mood improvement and cardiovascular disease prevention. In fact, results of a longitudinal study led by Feng—published in 2017—showed that daily consumption of tea can reduce the risk of cognitive decline in older persons by 50%. Following this discovery, Feng and his team further explored the direct effect of tea on brain networks. The research team recruited 36 adults aged 60 and above, and gathered data about their health, lifestyle, and psychological well-being. The elderly participants also had to undergo neuropsychological tests and magnetic resonance imaging (MRI). The study was carried out from 2015 to 2018. Upon analyzing the participants’ cognitive performance and imaging results, the research team found that individuals who consumed either green tea, oolong tea, or black tea at least four times a week for about 25 years had brain regions that were interconnected in a more efficient way. “Take the analogy of road traffic as an example—consider brain regions as destinations, while the connections between brain regions are roads,” said Feng. “When a road system is better organized, the movement of vehicles and passengers is more efficient and uses less resources. Similarly, when the connections between brain regions are more structured, information processing can be performed more efficiently.” He added, “We have shown in our previous studies that tea drinkers had better cognitive function as compared to non-tea drinkers. Our current results relating to brain network indirectly support our previous findings by showing that the positive effects of regular tea drinking are the result of improved brain organization brought about by preventing disruption to interregional connections.” As cognitive performance and brain organization are intricately related, more research is needed to better understand how functions like memory emerge from brain circuits, and the possible interventions to better preserve cognition during the ageing process. Feng and his team plan to examine the effects of tea as well as the bioactive compounds in tea can have on cognitive decline.
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