Walnuts may help reduce not only the risk of prostate cancer, but breast cancer as well. Walnuts contain the amino acid l-arginine, that offers multiple vascular benefits to people with heart disease, or those who have increased risk for heart disease due to multiple cardiac risk factors. Walnuts contain a number of neuroprotective compounds, including vitamin E, foliate, melatonin, omega-3 fats, and antioxidants. WWealnut consumption may support brain health, including increasing inferential reasoning in young adults.