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.
While the exact causes of prostate cancer are not known, certain risk factors have been linked to prostate cancer. A risk factor is something that increases a person's chance of getting a disease. Aging is the greatest risk factor for prostate cancer. Family history also plays a role.