To assess possibility of polyphenol-enriched oolong tea to reduce dietary lipid absorption in humans.
Twelve healthy adult subjects, three males and nine females, aged (mean±s.d.) 22.0±1.8 years, respectively, were randomly divided into two groups. The participants were followed a double-blind placebo-controlled crossover design, including 7-day washout periods and 10-day treatment periods. During the treatment periods, subjects were given about 38 g of lipids from potato chips (19 g each within 30 min after lunch and dinner) and total 750 ml beverages (placebo- or polyphenol-enriched oolong tea) at three meals. Blood samples were collected for biochemical examination at days 8, 18, 25 and 35 of the study period. On the last 3 days of each treatment period, feces were collected to measure the excretion of lipids.
Lipid excretion into feces was significantly higher in the polyphenol-enriched oolong tea period (19.3±12.9 g/3day) than in the placebo period (9.4±7.3 g/3day) (P<0.01). Cholesterol excretion tended to increase in polyphenol-enriched oolong tea period (1.8±1.2 g/3day) compared with that of placebo (1.2±0.6 g/3day) (P=0.056).
The results of this study indicated that polyphenol-enriched oolong tea could increase lipid excretion into feces when subjects took high-lipid diet.
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I am indebted to the students at Providence University, Taichung, Taiwan. Financial support for the study was obtained from Suntory Ltd, Osaka, Japan. My special thanks are owing to Afework Kassu for valuable comments and criticisms.
Guarantors: K Abe and S Yamamoto.
Contributors: T-FH and AK contributed to the protocol, experiment, data analysis and manuscript writing. KA and YK contributed to the protocol, preparation beverage and manuscript writing. KH contributed to the protocol, arrangement of the subjects. M-FW contributed to the protocol, management of the subjects. SY contributed to the protocol, management of the subjects, data analysis and manuscript writing.
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Hsu, TF., Kusumoto, A., Abe, K. et al. Polyphenol-enriched oolong tea increases fecal lipid excretion. Eur J Clin Nutr 60, 1330–1336 (2006). https://doi.org/10.1038/sj.ejcn.1602464
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