Fish intake and prostate cancer:
A cohort study from Japan reviewed data from 5589 men age 30-79 and found that those men who consumed a higher intake of fish had a lower risk of dying from prostate cancer than those with a lower intake of fish (30). A review and meta-analysis confirmed that prostate cancer mortality was lower among subjects with fish consumption, but there was no reduction seen in the incidence of prostate cancer (22).
Fiber intake and prostate cancer:
Deschasaux, M et al followed 3313 men over the course of 12 years. The authors calculated the risk of prostate cancer using hazard ratios and found the following conclusions. The groups with the highest total fiber, highest insoluble fiber, and highest legume intake had a 53%, 54%, and 45% lower risk of prostate cancer respectively when compared to the lowest intakes. In this study, soluble fiber, vegetable, and fruit intake did not lower or increase the risk of prostate cancer. (23)