原因不明。我觉得也许与free的雄性激素增加有关。这件事本身也有些争议，见内。

Most studies have not found that being obese (very overweight) is linked with a higher risk of getting prostate cancer overall.

Some studies have found that obese men have a lower risk of getting a low-grade (less dangerous) form of the disease, but a higher risk of getting more aggressive prostate cancer. The reasons for this are not clear.

Some studies have also found that obese men may be at greater risk for having more advanced prostate cancer and of dying from prostate cancer, but not all studies have found this.