Subjects will be instructed not to change their diets, exercise or lifestyle during the course of the study. They will also be instructed not to consume any citrus fruit/juice (orange, grape fruit) throughout the study. Three 24-hour dietary recalls will be collected by telephone during the last week of each metabolic period (P1, P2, P3). A standardized diet will be served for all three meals for each day prior to the blood draws.