The purpose of this study is to learn more about what causes insulin resistance. It has been suggested that proper breakdown of fat into energy (oxidation) in the body is important to allow insulin to keep blood sugar in the normal range. The investigators want to know if having one of the fatty acid oxidation disorders could have an influence on insulin action. Fatty acid oxidation disorders are genetic disorders that inhibit one of the enzymes that converts fat into energy. The investigators will study both normal healthy people and people with a long-chain fatty acid oxidation disorder.
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Glucose Disposal Rate (Rd)- the Rate of Glucose Infusion to Maintain Euglycemia During Steady State Insulin Infusion in mg/Min
Timeframe: Calculated during the last 30 minutes of a 300 minute clamp.