A Trial Investigating the Effect of NN5401 in Subjects With Type 2 Diabetes

Inclusion Criteria: * Type 2 diabetes mellitus (as diagnosed clinically) for at least 12 months * Body mass index below or equal to 35.0 kg/m\^2 Exclusion Criteria: * Subject who has donated any blood or plasma in the past month or more than 500 mL within 3 months prior to screening * Smoker (defined as a subject who is smoking more than 5 cigarettes or the equivalent per day) * Not able or willing to refrain from smoking and use of nicotine gum or transdermal nicotine patches during the inpatient period