Fig. 2. Incremental changes in postprandial plasma insulin concentrations (pmol/L) relative to baseline in healthy subjects following the control drink (), the caffeinated drink (positive control) () and tea drink (•) (n = 16). Values are means ± SEM. A significant increase in insulin concentration was found after tea vs the control at 90min and after tea vs caffeine at 90mins and 150min. A significant increase in insulin concentration after caffeine vs tea was found at 30min and 120min. Means highlighted with * denote significant difference at P<0.05 and with ** denote statistical difference at P<0.01 (ANOVA, contrast testing and Bonferroni correction), n = 16.