Objective: To assess possibility of polyphenol-enriched oolong tea to reduce dietary lipid absorption in humans. Design: Twelve healthy adult subjects, three males and nine females, aged (mean7s.d.) 22.071.8 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 polyphenolenriched 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. Results: Lipid excretion into feces was significantly higher in the polyphenol-enriched oolong tea period (19.3712.9 g/3day) than in the placebo period (9.477.3 g/3day) (Po0.01). Cholesterol excretion tended to increase in polyphenol-enriched oolong tea period (1.871.2 g/3day) compared with that of placebo (1.270.6 g/3day) (P ¼ 0.056). Conclusions:The results of this study indicated that polyphenol-enriched oolong tea could increase lipid excretion into feces when subjects took high-lipid diet.

Background: Obesity is associated with development of diabetes. However, it seems that the level of obesity in association with diabetes may differ from country to country. Aim:To compare BMI and waist circumference in diabetic patients between Vietnamese and Taiwanese.Methods: Subjects were found to be diabetes mellitus by the health examination and had not treatment before. They were 163 Vietnamese and 298 Taiwanese. Body weight, height and waist circumference were measured Results: Compared with Taiwanese, the Vietnamese diabetes had significantly lower in BMI (23.1±4.1 vs. 25.9 ± 3.4 kg/m2, p< 0.001), and waist circumference (82.2 ± 10.2 vs. 86.8± 9.4 cm, p< 0.001; respectively). Conclusion:Vietnamese people may develop diabetes at smaller increase of BMI and waist circumference than the increase in these indices to induce diabetes in Taiwanese, thus indicating that the factors of Type 2 DM in Vietnam such as BMI, genetic, dietary and life-style which have inter-correlate complexly. It requires further in-vestigations.