April 14, 2011 11:22 am Fighting Cancer With Diet and Exercise A doctor says maintaining a healthy lifestyle can help prevent cancer, as well as extend the life of patients diagnosed with the disease. US & World Videos 1:37 Pro-Palestinian protesters gather outside White House correspondents' dinner 2:05 How ‘Love Is Blind' made Vanessa Lachey and Nick Lachey's marriage stronger 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