Pathogenesis of the Cardiometabolic Risk in Youth With Type 1 Diabetes

Each participant consumes a dinner scaled to his/her energy needs which is prepared by the metabolic kitchen. Dinner will be provided beforehand if patient does this portion at home. The participant consumes the first of three doses of D2O. Two additional doses of D20 are given at on day 1 and on day 2. The total D2O given (3 ml per kg of body water) is designed to raise body deuterium levels to 0.3% and is administered as described above to maintain steady state until the end of the study. At the HRU, an IV catheter will be inserted in order to collect blood to assess DNL. Blood draws begin during the fasting state to assess basal rates of DNL and then for six hours after the consumption of a glucose/fructose beverage (75g glucose and 25g fructose ) to assess postprandial rates of DNL. Blood draws will be taken 15 minutes before ingestion of the sugar beverage, then for every half hour for 6 hours.