Abstract
BackgroundData relating to the association between tea consumption and blood pressure change are inconsistent. The aim of this analysis was to investigate the association between tea consumption and the change in blood pressure (BP) in Chinese adults over a 5-year period.MethodsData from 1109 Chinese men (N= 472) and women (N= 637) who participated in the Jiangsu Nutrition Study (JIN) were analysed. BP was measured in 2002 and 2007. Tea (green, black and total tea) consumption was quantitatively assessed at the follow-up survey in 2007.ResultsTotal tea and green tea consumption were inversely associated with 5-year diastolic BP (DBP) but not systolic BP (SBP) change. In the multivariable analysis, compared with no consumption of tea, those with daily total tea/green tea consumption of at least10 g had 2.41 mmHg and 3.68 mmHg smaller increase of DBP respectively. There was a significant interaction between smoking and total tea/green tea consumption and DBP change. The inverse association between total tea/green tea consumption and DBP change was significant only in non-smokers. Green tea consumption was inversely associated with SBP change only in non-smokers and those without central obesity.ConclusionThe consumption of green tea is inversely associated with 5-year BP change among Chinese adults, an effect abrogated by smoking.Electronic supplementary materialThe online version of this article (doi:10.1186/1475-2891-13-98) contains supplementary material, which is available to authorized users.
Highlights
Data relating to the association between tea consumption and blood pressure change are inconsistent
The objective of the study was to assess the association between tea consumption and 5-year blood pressure (BP) changes, and the interaction between tea consumption and lifestyle factors in relation to BP changes among Chinese adults aged 20 years and above, based on a large population study in China: The Jiangsu Nutrition Study (JIN)
Compared with the retained participants (n= 1682), those lost to follow-up (n= 1167) were generally younger, with a higher BMI, waist circumference and lower systolic BP (SBP), but there were no differences in energy intake, Diastolic BP (DBP) or gender (Additional file 1: Table S1)
Summary
Data relating to the association between tea consumption and blood pressure change are inconsistent. The aim of this analysis was to investigate the association between tea consumption and the change in blood pressure (BP) in Chinese adults over a 5-year period. An inverse association between tea consumption and blood pressure (BP) has been reported in cross-sectional epidemiological studies [13,18,19]. Some short-term trials in humans have shown a positive association between tea and BP [24,25,26]. A systematic review on five randomized clinical trials concluded that there was no effect of tea consumption on BP [12]. There is no longitudinal study on the association between regular tea consumption and BP, and the interactions between tea consumption and other lifestyle factors have not been assessed
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