Inclusion Criteria:  18 years old or older Healthy Non-smoker  Exclusion Criteria:  No history of gastrointestinal, hepatic, or renal disorders Not currently taking any prescription or over-the-counter medications Not currently taking any herbal/vitamins supplements Not pregnant or lactating No allergies or intolerances to the foods that will be used in the study (parsnips, parsley, celery, broccoli, Brussels sprouts, and hamburger)