Risk factors are established risk factors for developing this disease. Age The chance of having prostate cancer increases rapidly after age 50. Over 70 of cases are diagnosed in men over 50 years. Race Prostate cancer occurs about 70 more often in African American men than in white American men. The men of Asian people in the Pacific islands have lower rates of incidence and mortality. Nationality, environment and lifestyle in Sweden gives the highest risk of prostate cancer, it presents intermediate values in North America and Europe, and low in Taiwan and Japan. However, the Japanese who emigrated to the U.S. suffer with a frequency similar to that of other men of that country. Diet Nutrition appears to play an important role in its development. The geographical distribution of this cancer shows high values in industrialized or developed countries.Studies are underway to test whether certain substances reduce the risk of prostate cancer. For now, eat less meat and dairy fats, and eating more than five times a day fruit and vegetables. Physical inactivity and obesity, regular physical exercise and maintaining a healthy weight may help reduce the risk. Obesity defined as body mass index greater than 29kg/m2 is associated with twice the risk of prostate cancer in men with normal weight, moreover, in these cases, the tumor is diagnosed in more advanced stage and more aggressive. Family history of prostate cancer seems to occur more frequently in some families, suggesting that there is a herary factor. Having a father or brother with prostate cancer doubles the risk for this disease. Labor Workers in the rubber and cadmium in solders and batteries seem to be more likely to develop prostate cancer.Cadmium is a heavy metal that disrupts the natural process of cellular DNA repair and may allow uncontrolled proliferation of malignant cells in tumors. Infectious agents and sexual activity has been considered infectious agents transmitted through sexual contact may cause prostate cancer. However, epidemiological studies have provided virological and immunological results. They have shown no specific evidence for an infectious cause of prostate cancer, such as gonorrhea, human papilloma virus (HPV) and other types of urethritis, prostatitis and sexually transmitted diseases. Has recently been reported that daily masturbation between 20 and 50 years reduces the risk of prostate cancer citation needed and is believed to be due to the elimination of carcinogenic substances in the semen. Snuff The snuff, according to recent studies is also a risk factor for prostate cancer. Cigarette smoking increases the production of male hormones.They stimulate cell growth and, therefore, the growth of prostate tumors. On the other hand, the cadmium content in cigarettes is also another risk factor.