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.
Toxins found in the urine allow for bacteria to form that leads to prostate infection and the formation of prostate calcification. Prostate calcification, or prostate stones are believed to be a leading cause of chronic prostatitis and chronic pelvic pain syndrome. Prostate stones are fairly common in men over age 50, and affect up to 75% of middle-aged men who have enlarged prostate or prostate infection.