Right back when J was diagnosed, I found research that nuts reduced the aggressiveness of PCa, especially walnuts. There are old threads about it on here. However, there was also some persuasive research that this did not include peanuts - which increased the aggressiveness instead. So for the last 6 years he has been eating nuts with breakfast and as snacks but has craved the peanuts he isn't allowed (he probably buys them in the pub when I am not there)
The problem is, did the American research quoted above take into account other factors? Could the men that are more nuts also have been more health conscious and therefore more rigorous about getting PSA tests and seeking medical advice? That would also reduce the risk of dying.