Comparison of the Effect on the Glucose Infusion Rates Between Inhaled Technosphere Insulin and a Subcutaneous Injection of Regular Human Insulin

Inclusion Criteria: * Subjects must be in good health, as judge by brief history and physical examination. * Sex: both, male and female. * Age: 18-40 years. * Body mass index: 18-27 kg/m2. * Capability to reach peak inspiratory flow of \>41/sec measured by a computer assisted spirometry. * FEV1 equal to or greater than 80% of predicted normal. Exclusion Criteria: * Diabetes Mellitus type 1 or type 2. * Human insulin antibodies. * Anamnestic history of hypersensitivity to the study medication or to drugs with similar chemical structures. * Having a history of severe or multiple allergies. * Treatment with any other investigational drug in the last three months before study entry. * Progressive fatal disease. * History of significant cardiovascular, respiratory, gastrointestinal, hepatic, renal, neurological, psychiatric and /or hematological disease. * Having ongoing respiratory tract infection. * Smoker defined as subjects with evidence or history of tobacco or nicotine use in the last year prior to entry in the study. * Blood donation within the last 30 days. * A woman who is lactating. * Pregnant women or women intending to become pregnant during the study. * A sexually active woman of childbearing age not actively practicing birth control or using medically accepted device or therapy. * A lack of compliance or other reasons, which prevent to the opinion of the investigator the participation of the subject in the study.