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http://dx.doi.org/10.4162/nrp.2012.6.1.68

Dietary flavan-3-ols intake and metabolic syndrome risk in Korean adults  

Yang, Yoon-Jung (Department of Nutritional Science and Food Management, Ewha Womans University)
Kim, You-Jin (Department of Nutritional Science and Food Management, Ewha Womans University)
Yang, Yoon-Kyoung (Department of Nutritional Science and Food Management, Ewha Womans University)
Kim, Ji-Yeon (Department of Nutritional Science and Food Management, Ewha Womans University)
Kwon, O-Ran (Department of Nutritional Science and Food Management, Ewha Womans University)
Publication Information
Nutrition Research and Practice / v.6, no.1, 2012 , pp. 68-77 More about this Journal
Abstract
Flavan-3-ols are a subclass of flavonoids found in a variety of foods including teas. The effects of flavan-3-ols on the risk of metabolic syndrome (MetS) have been investigated, generally focusing on tea catechins or individual flavan-3-ol rich foods, but there is little information on dietary flavan-3-ols intake and risk of MetS in population-based studies. In this cross-sectional study, we examined the association between dietary flavan-3-ols intake and the risk of MetS in Korean adults. Subjects comprised 1,827 men and 2,918 women aged 20-69 years whose data was included in the 2008 Korean National Health and Nutrition Examination Survey. This survey was conducted between January 2008 and December 2008. Total flavan-3-ols intakes were calculated from 24-hour dietary recalls using a flavonoids database. Thirty percent of the male subjects and 24% of the female subjects were reported as having MetS. In the female subjects, flavan3-ols intake was inversely associated with the risk of MetS after adjusting for potential confounders (5th vs. 1st quintile, OR=0.64, 95% CI=0.45-0.91, P for trend=0.384). The main food source of flavan-3-ols was green tea followed by apples and grapes. Among MetS components, flavan-3-ols intake was inversely associated with the risk of high blood pressure after adjusting for potential confounders (5th vs. 1st quintile, OR=0.64, 95% CI=0.45-0.90, P for trend=0.005). No significant association between flavan-3-ols intake and risk of MetS was found in the male subjects. After stratified analysis by obesity (BMI ${\geq}$ 25 or BMI < 25), however, flavan3-ols intake was inversely related to the risk of hypertension in non-obese men. These results suggest that dietary flavan-3-ols intake may have beneficial effects on MetS risk by reducing the risk of hypertension. The effects of flavan-3-ols intake dependent on obesity need further investigation.
Keywords
Flavan-3-ols; metabolic syndrome; flavonoids; hypertension; hyperglycaemia;
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