May 6, 2009 9:26 pm Walnuts Could Lower Breast Cancer Risk Women who add walnuts to their diets as a healthy snack may also be lowering their risk for breast cancer. US & World Videos 2:03 Does Shakira still believe in love following Gerard Piqué split? 1:36 O.J. Simpson's cause of death revealed 25:57 WATCH: ‘Changing Climate' highlights the Philly-area residents who are combatting climate change 2:36 Super dad makes Mario-themed obstacle course for son's birthday 4:17 How the Philadelphia Union became the sustainability champs of the MLS