Acute ingestion of catechin-rich green tea improves postprandial glucose status and increases serum thioredoxin concentrations in postmenopausal women

Abstract

Elevated postprandial hyperglycaemia and oxidative stress increase the risks of type 2 diabetes and CVD. Green tea catechin possesses antidiabetic properties and antioxidant capacity. In the present study, we examined the acute and continuous effects of ingestion of catechin-rich green tea on postprandial hyperglycaemia and oxidative stress in healthy postmenopausal women. Participants were randomly assigned into the placebo (P, n 11) or green tea (GT, n 11) group. The GT group consumed a catechin-rich green tea (catechins 615mg/350ml) beverage per d for 4 weeks. The P group consumed a placebo (catechins 92mg/350ml) beverage per d for 4 weeks. At baseline and after 4 weeks, participants of each group consumed their designated beverages with breakfast and consumed lunch 3h after breakfast. Venous blood samples were collected in the fasted state (0h) and at 2, 4 and 6h after breakfast. Postprandial glucose concentrations were 3% lower in the GT group than in the P group (three-factor ANOVA, group×time interaction, P<0·05). Serum concentrations of the derivatives of reactive oxygen metabolites increased after meals (P<0·05), but no effect of catechin-rich green tea intake was observed. Conversely, serum postprandial thioredoxin concentrations were 5% higher in the GT group than in the P group (three-factor ANOVA, group×time interaction, P<0·05). These findings indicate that an acute ingestion of catechin-rich green tea has beneficial effects on postprandial glucose and redox homeostasis in postmenopausal women.