Blood glucose tolerance. (A) Intraperitoneal glucose tolerance measured in mmol/L over a period of 90 min in 6- to 20-month-old control mice (n = 16 each group); numbers above data points at each time interval indicate significant differences according to the following scheme: 1, 6mo vs. 12mo; 2, 6mo vs. 18mo; 3, 6mo vs. 20mo; 4, 12mo vs. 18mo; 5, 12mo vs. 20mo; 6, 18mo vs. 20mo. Error bars show SEM. Solid line () denotes 6mo group, while perforated lines from longest to smallest denote 12 (- -), 18 (- - -) and 20mo (…) controls respectively. (B) Intraperitoneal glucose tolerance measured in mmol/L over a period of 90 min in 24-month-old control and low GI diet mice (n = 8 each group). Asterixes indicate significant difference in blood glucose concentration at each measured interval (P <0.05). Error bars show SEM. Solid line with triangular markers (-▲ -) denotes control group, perforated line with square markers (- -■--) denotes low GI group.