Dietary cadmium that is found in the environment and in phosphate fertilizers has contaminated farmlands and may lead to an increased risk of breast cancer according to a study published in Cancer Research in March of 2012. A study of nearly 56,000 women conducted over 12 years showed that higher exposure to cadmium via diet was linked with a 21% increased risk for developing breast cancer. The main sources of cadmium were from bread and cereals, potatoes, root crops and vegetables.