Blackberry Intake and Biomarkers of Cancer Risk

Inclusion Criteria: * Non-smoking men and women * Aged 40-75 * BMI 19-38 kg/m2 Exclusion Criteria: * Younger then 40 ears old or older than 75 years old * BMI less than 19 or greater than 38 * Use of blood-thinning medications such as warfarin, dicumarol, or anisinidione * Presence of kidney disease, liver disease, gout, certain cancers, untreated thyroid, gastrointestinal, other metabolic diseases or malabsorption syndromes * 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 of over-the-counter antiobesity medications or supplements 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 * Use of any tobacco products in the past 6 months * Use of oral or IV antibiotics during the month preceding the study or during the study * Unwillingness to abstain from vitamin, mineral, and herbal supplements for two weeks prior to the start of the study * Known (self-reported) allergy or adverse reaction to blackberries or gelatin * Unable or unwilling to give informed consent or communicate with study staff * Self-report of alcohol or substance abuse within the past 12 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