In this video, Mark Messina, PhD, MS, Adjunct Associate Professor in the Department of Nutrition, School of Public Health, at Loma Linda University, discusses soy and breast cancer. Cancer of the breast is the most common cancer among women and the second leading cause of cancer death. However, breast cancer rates vary markedly through the world. Several lines of evidence indicate that soyfoods reduce breast cancer risk but to derive protection, consumption has to occur during the early years, that is, during childhood and/or adolescence. Studies suggest consuming one serving per day, during this stage of life may reduce risk by as much as 50 percent.