There were some significant differences between proteins with BLG inducing a significantly greater effect on GIP secretion than ALA and BSA at 0.3125 and 5 mg/ml (P < 0.001) and ALA inducing a significantly greater effect compared with BSA at 1.25 and 2.5 mg/ml (P < 0.05–P < 0.01) (Fig. 4B).