c. Procedures From day 1 to day 22 patients will be maintained on enteral feeding of a high carbohydrate/amino acid mixture (Vivonex, Novartis, Minneapolis, MN). Vivonex contains 300 kcal/serving in the following caloric breakdown: 82.3% carbohydrate, 15% protein, 2.7% fat (linoleic acid). Patients will be given 25 kcal/kg of Vivonex plus an additional 45 kcal/kg for each percentage point of total body surface area burned. One half of the patients will be given fenofibrate (5 mg/kg/day - maximum daily dose) from the time of the first tracer study until the time of the second tracer study.