Inclusion Criteria:  Age 40-80 years Able to give informed consent Histologically proven prostate cancer BMI <35 No other cancer treatment Continent Good physical and mental activity On normal diet Scheduled for radical prostatectomy (open or robotic)  Exclusion Criteria:  Other malignant cancer (except for benign skin cancer) Age > 80 years Diabetes mellitus (any type) Chronic bowel inflammatory disease Urinary incontinence Impaired mental activity Previous radiotherapy of hormonal therapy Vegetarian/vegan/on macrobiotic diet