In Europe and the United States, prostate cancer is the most common malignant tumor in men, and in China, according to the latest statistics in 2007, the incidence of prostate cancer has ranked first among urological tumors in major cities such as Shanghai, Beijing and Guangzhou. Most patients with prostate cancer are asymptomatic in the early stages or show symptoms similar to those of benign prostatic hyperplasia. Screening for the disease through rectal examinations and prostate-specific antigen (PSA) tests has led to an increasing number of cancers being detected at an early clinical stage. The cause of prostate cancer is still unclear and many risk factors associated with prostate cancer need more research to further confirm. Among the many risk factors, there is a relationship between obesity and a high-fat diet and the development of prostate cancer.