Abstract
ObjectiveTo explore the associations of green tea and rock tea consumption with risk of impaired fasting glucose (IFG) and impaired glucose tolerance (IGT).MethodsA multistage, stratified, cluster, random-sampling method was used to select a representative sample from Fujian Province in China. In total, 4808 subjects without cardiovascular disease, hypertension, cancer, or pancreatic, liver, kidney, or gastrointestinal diseases were enrolled in the study. A standard questionnaire was used to gather data on tea (green, rock, and black) consumption and other relevant factors. The assessment of impaired glucose regulation (IGR) was using 75-g oral glucose tolerance test (OGTT), the diagnostic criteria of normal glucose tolerance was according to American Diabetes Association.ResultsGreen tea consumption was associated with a lower risk of IFG, while rock tea consumption was associated with a lower risk of IGT. The adjusted odds ratios for IFG for green tea consumption of <1, 1–15, 16–30, and >30 cups per week were 1.0 (reference), 0.42 (95% confidence intervals (CI) 0.27–0.65), 0.23 (95% CI, 0.12–0.46), and 0.41 (95% CI, 0.17–0.93), respectively. The adjusted odds ratios for IGT for rock tea consumption of <1, 1–15, 16–30, and >30 cups per week were 1.0 (reference), 0.69 (95% CI, 0.48–0.98), 0.59 (95% CI, 0.39–0.90), and 0.64 (95% CI, 0.43–0.97), respectively. A U-shaped association was observed, subjects who consumed 16–30 cups of green or rock tea per week having the lowest odds ratios for IFG or IGT.ConclusionsConsumption of green or rock tea may protect against the development of type 2 diabetes mellitus in Chinese men and women, particularly in those who drink 16–30 cups per week.
Highlights
Tea is consumed as a beverage worldwide, especially in Asia
A retrospective cohort study of 17413 Japanese adults demonstrated that green tea consumption was associated with a lower risk of diabetes, whereas consumption of oolong or black tea was not [4]
The baseline characteristics of the subjects grouped according to the level of green and rock tea consumption are shown in Tables 1 and 2, respectively
Summary
Tea is consumed as a beverage worldwide, especially in Asia. Because of the high prevalence of tea consumption, even small effects of tea at a population level may have a large impact on public health. Tea has been studied for its potential to influence insulin activity, plasma glucose concentration, and the incidence of diabetes. A retrospective cohort study of 17413 Japanese adults demonstrated that green tea consumption was associated with a lower risk of diabetes, whereas consumption of oolong or black tea was not [4]. Another prospective study conducted in ten European countries observed a linear inverse association between tea consumption and incidence of type 2 diabetes [5]. Other studies found no relationship between tea consumption and diabetes risk [6,7]
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