Blackberry Flavonoid Absorption and Effects on Intestinal Bacteria

Inclusion Criteria: * 25-75 years old Exclusion Criteria: * Use of blood-thinning medications such as Coumadin (warfarin), Dicumarol (dicumarol), or Miradon (anisindione) * Presence of any gastrointestinal disease, metabolic disease, or malabsorption syndromes that may interfere with the study goals * Have been pregnant during the previous 12 months, are currently pregnant or lactating, or plan to become pregnant during the study * Type 2 diabetes requiring the use of oral antidiabetic agents or insulin * Fasting triglycerides greater than 300 mg/dL * Fasting glucose greater than 126 mg/dL * History of eating disorders or other dietary patterns which are not consistent with the dietary intervention (e.g., vegetarians, very low fat diets, high protein diets) * Use of prescription or over-the-counter antiobesity medications or supplements (e.g., phenylpropanolamine, ephedrine, caffeine) during and for at least 6 months prior to the start of the study or a history of a surgical intervention for obesity * Active cardiovascular disease (such as a heart attack or procedure within the past three months or participation in a cardiac rehabilitation program within the last three months, stroke, or history/treatment for transient ischemic attacks in the past three months, or documented history of pulmonary embolus in the past six months). * Use of any tobacco products in past 3 months * Unwillingness to abstain from herbal supplements for two weeks prior to the study and during the study * Known (self-reported) allergy or adverse reaction to blackberries or other study foods * Unable or unwilling to give informed consent or communicate with study staff * Self-report of alcohol or substance abuse within the past twelve months and/or current acute treatment or rehabilitation program for these problems (Long-term participation in Alcoholics Anonymous is not an exclusion) * Other medical, psychiatric, or behavioral factors that in the judgment of the Principal Investigator may interfere with study participation or the ability to follow the intervention protocol