Inclusion Criteria:

- Men aged 40-75 years

- Low or intermediate grade prostate cancer (as defined by Gleason sum less than or
equal to 7) and clinical stage T1 or T2

- Serum PSA less than 20 ng/ml

- Have elected radical prostatectomy, Brachytherapy or active surveillance as their
primary treatment

Exclusion Criteria:

- No current physician diagnosed disease (including but not limited to): kidney
disease requiring dialysis, cognitive deficits, substance abuse

- BMI < 18.5 kg/m2 or > 40 kg/m2

- Use of any hormonal treatments, including but not limited to testosterone

- Any previous cancer diagnosis or treatment within the previous five years, excluding
non-melanoma skin cancer

- Inability or unwillingness to eat a diet that is free of Brassica vegetables for the
duration of the study

- Use of any dietary supplements other than a multivitamin (including herbal
preparations)

- Allergy to cruciferous vegetables or any of the specific fillers used in the placebo

- Usual consumption of > 5 servings per week of Brassica vegetables