Prostate cancer and diet - a randomized controlled trial on the effect of a dietary intervention on the quality of life of men and serum nutrient levels in their blood

INTERVENTION: A randomized controlled trial including three groups of low‐risk prostate cancer patients currently on active surveillance: (1) a control group, (II) a prostate cancer diet‐group, (III) a VERS+‐group. The two interventions groups (group II and III) will receive a prostate cancer diet and recipies to cook 4 dinner meals per week for a period of 3 months. Furthermore, both groups will receive some coaching on the impact of healthy eating, and how to change and maintain a healthier lifestyle. In addition, the VERS+‐group will receive the fruit and vegetables for cooking the meals through a food box. The control group will be informed about healthy eating as described in the guideline from 'het Voedingscentrum ‐ de Schijf van Vijf'. CONDITION: Prostate cancer, Dietary changes, Active surveillance ; ; PRIMARY OUTCOME: To improve participants' quality of life, as measured by the SF‐12 general health domain, by actively engaging in a prostate cancer diet. SECONDARY OUTCOME: (I) To improve participants' feeling of being in control of their disease, as measured with the Prostate Activation Measure (PAM), by actively engaging in a prostate cancer diet. (II) To measure the effect of a dietary intervention with special grown products on the serum nutrient concentrations of participants. (III) To survey the user behavior of both participants and their partners when engaging in a prostate cancer diet. (IV) To test the infrastructure of greenkeepers in the Westland, producing and delivering products for a specific, targeted patient population instead of the general public. INCLUSION CRITERIA: Men (aged > 18 years), diagnosed with low‐risk prostate cancer defined as T1 or T2a, Gleason 2‐6 and PSA level <10 ng/ml, who are currently on active surveillance. Participants must be able to understand and read Dutch. Furthermore they must be able to cook meals or have meals prepared for them.