Blood drawn at different time points will be used to measure glucose, insulin, free fatty acids, reactive oxygen species (F2- isoprostanes by mass spectrometry (also referred to as 8-iso-PGF2α) (Milne 2007)), and total antioxidant capacity (Total Antioxidant Capacity Assay (TAC), Cell Biolabs, Inc., San Diego, CA). All of these measurements will help us to better understand insulin resistance, oxidative stress, and mechanisms that could be contributing to either condition.