Two-h glucose and insulin area under the curve values , respectively , for the caffeine ( 658 74 mmol/L and 30,005 13,304 pmol/L ) , green coffee bean extract ( 637 100 mmol/L and 31,965 23,586 pmol/L ) , and placebo ( 661 77 mmol/L and 27,020 12,339 pmol/L ) trials were not significantly different ( P > 0.05 ) .