Up to a third of breast cancers could be avoided

Up to a third of breast cancer cases in Western countries could be avoided if women ate less and exercised more, researchers at a conference said, renewing a sensitive debate about how lifestyle factors affect the disease. Better treatments, early diagnosis and mammogram screenings have dramatically slowed breast cancer, but experts said the focus should now shift to changing behaviors like diet and physical activity. "What can be achieved with screening has been achieved. We can't do much more," Carlo La Vecchia, head of epidemiology at the University of Milan, said in an interview. "It's...