<qa>  What is the rate of fat oxidation in the fed state?1. To determine if a higher intake of oleic acid and a reciprocally lower intake of palmitic acid is associated with a higher rate of fat oxidation. We hypothesize that the rate of fat oxidation ghr in the fed state, adjusted for the covariate effect of the rate of fat oxidation on the solid food diet, will be higher 30 in those subjects randomized to the OA-enriched diet compared to controls. Furthermore, we hypothesize that fat oxidation will not be higher when expressed as a proportion of energy expenditure in the OA-enriched formula group. That is, we expect energy expenditure in the fed state to be higher in those fed the OA-enriched diet. 