Baseline Visit A At the scheduled baseline visit subjects will report to the Ragle Human Nutrition Research Center located on the UC Davis campus (1283 Academic Surge, University of California, Davis, in Davis CA 95616) for a 12-hour fasting blood draw and anthropometric measurements. They will be asked to bring their stool sample to this visit. Each participant will also be asked to complete a health history questionnaire, a physical activity questionnaire, and a Food Frequency Questionnaire (FFQ). The duration of the baseline study visit will be approximately 1 hour.