A protein hydrolysate having a degree of hydrolysis between 1 and 40% and containing between 1 and 70 wt. % of peptides having a molecular weight of less than 500 Da and less than 55 wt. % of peptides or proteins having a molecular weight of more than 5000 Da, on the basis of the total proteinaceous material of the composition, is effective in stimulating secretion of glucagon-like peptide-1 (GLP-1). In addition, the hydrolysate may have DPP-IV inhibiting activity. The hydrolysate is suitable for the manufacture of a medicament, or food product for prophylaxis and/or treatment of a GLP-1 mediated condition, in particular obesity, type 2 diabetes mellitus and an immunological disorder.
