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The Effect of Consuming Instant Black Tea on Postprandial Plasma Glucose and Insulin Concentrations in Healthy Humans

King's College London, School of Biomedical and Health Sciences, Nutrition Health and Food Research Centre, Biopolymers Group, London (J.A.B., P.R.E.)
University of Central Lancashire, Lancashire School of Health and Postgraduate Medicine, Preston (P.A.J.), UNITED KINGDOM

View larger version (11K): [in this window] [in a new window]   Fig. 1. Incremental changes in postprandial plasma glucose concentrations (mmol/L) relative to fasting in healthy subjects following consumption of the control drink (), the caffeinated drink (positive control) () and tea drink (•) (n = 16). Values are means ± SEM. A statistically significant reduction in glucose concentration was found after tea vs the control and after tea vs caffeine at 120min. Mean is highlighted with ** and denotes significance at P<0.01 (ANOVA, contrast testing and Bonferroni correction), n = 16.

View larger version (11K): [in this window] [in a new window]   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.