Faculty of Health, University of Canberra, 2617 Canberra, Australia.
Collaborative Research in Bioactives and Biomarkers (CRIBB) Group, University of Canberra, 2617 Bruce, Australia.
Molecules. 2019 May 15;24(10):1862. doi: 10.3390/molecules24101862.
Tea is one of the most-widely consumed beverages in the world with a number of different beneficial health effects, mainly ascribed to the polyphenolic content of the tea catechins. The aim of this study was to examine the consumption of green, black, or no tea, in relation to the previously validated successful ageing index (SAI; higher values "healthier" ageing) in a combined analysis of adults aged >50 years old from the ATTICA ( = 1128 adults from Athens, Greece metropolitan area) and the MEDiterranean Islands Study (MEDIS) ( = 2221 adults from various Greek island and Mani) studies. After adjusting for age, sex, smoking, and coffee consumption, green tea was positively associated with SAI (b ± SE: 0.225 ± 0.055, 0.001), while black tea was negatively associated with SAI (unstandardized b coefficient ± Standard error: -0.807 ± 0.054, < 0.001). Green tea (vs black tea) consumption, had higher odds of a SAI of over 3.58 out of 10 (OR: 1.77, 95% CI: 1.38-2.28). Green tea consumption was also associated with higher levels of physical activity ( 0.001) and reduced likelihood of hypertension ( = 0.006) compared with black tea. Two possible mechanisms are that green tea possesses high levels of catechins such as (-)-epigallocatechin 3-gallate and l-theanine compared with black tea. Therefore, the present analysis supports both the role of green tea constituents in successful ageing, as well as its role as an important component of an overall healthy diet in adults aged 50 years and over from these two epidemiological studies.
茶是世界上最广泛饮用的饮料之一，具有许多不同的有益健康的作用，主要归因于茶儿茶素的多酚含量。本研究的目的是在对来自 ATTICA（来自希腊雅典大都市区的 1128 名成年人）和 MEDIS（来自希腊各个岛屿和马尼亚的 2221 名成年人）研究的成年人进行综合分析时，研究饮用绿茶、红茶或不喝茶与先前经过验证的成功老龄化指数（SAI；更高的值表示“更健康”的老龄化）之间的关系。在调整年龄、性别、吸烟和咖啡消耗后，绿茶与 SAI 呈正相关（b ± SE：0.225 ± 0.055，0.001），而红茶与 SAI 呈负相关（未标准化 b 系数 ± 标准误差：-0.807 ± 0.054，<0.001）。与红茶相比，饮用绿茶（而非红茶）更有可能使 SAI 超过 10 分中的 3.58 分（OR：1.77，95%CI：1.38-2.28）。与红茶相比，饮用绿茶还与更高水平的体力活动（0.001）和降低高血压的可能性相关（= 0.006）。两种可能的机制是，与红茶相比，绿茶含有高水平的儿茶素，如（-）-表没食子儿茶素 3-没食子酸酯和 L-茶氨酸。因此，本分析支持绿茶成分在成功老龄化中的作用，以及其在这两项流行病学研究中 50 岁及以上成年人整体健康饮食中的重要组成部分的作用。
