1. A hyperinsulinemic euglycemic clamp will be performed to measure peripheral insulin sensitivity. Intravenous catheters are placed within each arm (one for infusion, and one for blood collection). Then, a compound called insulin (supplied by the Investigational Drug Service (IDS)) is infused as a loading dose followed by a continuous infusion to achieve a steady state condition. Blood samples are collected every 5 minutes, and glucose levels are measured. Blood glucose levels will be controlled by the infusion of a 20% dextrose solution. The mean dextrose infusion rate (M) over the period between 120 and 180 minutes will be used to measure insulin sensitivity. At 180 minutes, the study will conclude, and both infusions will be stopped.