ctarleton posted a link to a YouTube video of a presentation by an expert on diet and exercise for prostate cancer patients at the University of California. See: uctv.tv/shows/Diet-and-Exer...
It turns out, according to her studies, that men diagnosed with prostate cancer (non-metastatic I think, but don't recall for sure) who get the best diet and exercise have a 68% reduced risk of progressing to lethal prostate cancer as compared to men who eat a poor diet and don't exercise.
If she's right, that's a tremendous benefit. Ir reduces all cause mortality as well as prostate cancer specific mortality - and the side effects of increased energy, greater strength, reduced body fat, etc., sure are a lot better than the side effects from androgen deprivation, chemotherapy, etc.
So, go for it! Eat healthy. Work out. It's worth it.
Alan