The Effect of NN1250 in Subjects With Type 2 Diabetes of Different Race and/or Ethnic Origin

Inclusion Criteria: * Either - Black or African American not of Hispanic or Latino origin or - White of Hispanic or Latino origin or - White not of Hispanic or Latino origin * Type 2 diabetes mellitus (as diagnosed clinically) for at least 12 months * Treated with insulin for at least 3 months, alone or in combination with maximum 2 oral antidiabetic drugs (OADs) * Body mass index maximum 40.0 kg/m\^2 Exclusion Criteria: * Use of GLP-1 receptor agonists (exenatide, liraglutide), thiazolidinediones or dipeptidyl peptidase-4 (DPP-4) inhibitors within 3 months prior to screening * History of multiple and/or severe allergies to drugs or foods or a history of severe anaphylactic reaction * Subject who has donated any blood or plasma in the past month or more than 500 mL within 3 months prior to screening