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.
No. Prostate Cancer is caused by a metabolite of Testosterone that goes up as men age, DHT or Di-hydrotestosterone. When we supplement testosterone with we monitor the DHT levels and generally they go down, but if they increase we use blocking agents to stop the conversion.