They were only forbidden to partake of the Tree of Knowledge of Good and Evil. Some of the best information we have on the Tree of Life comes from I Nephi 11. Nephi is trying to obtain the interpretation of the dream his father had.
Factors that increase the risk of prostate cancer include: older age, a family history of the disease, and race. About 99% of cases occur in those over the age of 50. Having a first-degree relative with the disease increases the risk two to threefold.
Prostate cancer, like many cancers, initially just affects the body organ where it started (in this case the prostate). If the prostate cancer continues to grow, it can block or obstruct the urethra, which carries urine from the bladder through the penis. This can cause urinary obstruction and kidney damage.