Dreamerboy,
Like you said...
However, I've heard it said that prostate cancer is at least 60% diet related and prostate cancer incidence in various countries seem to strongly support this. Countries that have low access and/or low consumption of processed food, sugar, milk and red meat have a dramatically lower rates of prostate cancer. But when people from these societies move to North America, their prostate cancer rates increase, particularly by the second generation.
You'll have to look a long way find anyone who disagrees with that statement. Willett, Taubes, Ornish,Tim G, and I will all sign on.
The disagreement arises when you try to tease out the individual bits on that list. While epidemiological studies can convincingly implicate the western diet as
a cause of cancer the case against red meat, specifically, is a bit more wobbly. I'm not saying that the science is wrong, I am saying that the observed effect is fairly small and the controlled experiments needed to eliminate confounding external variables haven't been done.