Scientists say too many carbs may increase more than just waistlines -- they might raise the risk of breast cancer. The study is one of the few to examine how the popular but controversial low-carb diet craze might affect the odds of getting cancer, as opposed to its effects on cholesterol and heart disease. According to a study, women in Mexico who ate a lot of carbohydrates were more than twice as likely to get breast cancer than those who ate less starch and sugar. How applicable the results are to American women is debatable. Carbohydrates make up half of the typical American diet and that's less than what most of the women in this study consumed.