Abstract: The present invention relates to a method of identifying a predisposition for developing type 2 diabetes mellitus in a subject, said method comprising the step of assessing in a sample obtained from said subject the amount of one or more metabolite(s) selected from (a) a first group comprising the metabolites glycine, lysoPhosphatidylcholine acyl C18:2, lysoPhosphatidylcholine acyl C17:0, lysoPhosphatidylcholine acyl C18:0, lysoPhosphatidylcholine acyl C18:1, phosphatidylcholine acyl-alkyl C34:2, phosphatidylcholine acyl-alkyl C36:2, phosphatidylcholine acyl-alkyl C36:3 and isobaric metabolites having the same molecular mass as glycine, lysoPhosphatidylcholine acyl C18:2, lysoPhosphatidylcholine acyl C17:0, lysoPhosphatidylcholine acyl C18:0, lysoPhosphatidylcholine acyl C18:1, phosphatidylcholine acyl-alkyl C34:2, phosphatidylcholine acyl-alkyl C36:2 or phosphatidylcholine acyl-alkyl C36:3 but different chemical formula; and/or (b) a second group comprising the metabolite acetylcarnitine C2 and an isobaric m