Because it's not true..."The results, reported in the American Journal of Epidemiology, do not prove that a plant-rich diet, itself, cuts breast cancer risk."

Almost every woman I know eats a plant-rich diet. A few of these women have developed breast cancer. Almost every man I know eats a meat-rich diet. None of those men have developed breast cancer. If I was writing a news article I would claim that meat-rich diets are tired to lower breast cancer risk.