A peptide having 12 to 60 amino acids and including (a) a sequence of SEQUENCE ID NO: 11, or (b) a fragment of SEQUENCE ID NO: 11 that includes the sequence of SEQUENCE ID NO: 1 or 5, is described for use in improving glycemic management in a mammal. A composition, for example a food product, that includes substantially all of the peptides of SEQUENCE ID NO:'s 1 to 11, that is capable of reducing post-prandial blood glucose levels, and increasing insulin secretion in humans, is also described.