“Up to a third of breast cancer cases could be avoided if women ate less and exercised more, researchers claim. Experts believe more than 14,000 women a year would probably not develop the disease if they had adopted healthier behaviour from an early age. Modern lifestyles which feature regular drinking, lack of exercise and increased obesity are fuelling the rise of the disease, the European Breast Cancer Conference heard yesterday. Around 45,000 cases of breast cancer are diagnosed each year in Britain. Carlo La Vecchia, of Milan University, told the conference in Barcelona: 'What can..