IGF1 and breast carcinoma: While some evidence suggested that dairy products contain high amounts of calcium and vitamin D which can bind to cancer-causing acids and metabolites to reduce breast cancer risk (McCann et al., 2017), some other evidence found that dairy products may increase cell proliferation due to their high levels of growth-promoting factors such as insulin-like growth factor 1 (IGF-1) (Djamil and Arezki, 2015).