"At this stage, we can only recommend limiting the consumption of processed foods, the source of industrially produced trans-fatty acid," the researchers wrote in the American Journal of Epidemiology. Trans-fats or trans-fatty acids are made in creating artificially hardened fats -- in the process of hydrogenization, for instance. They were, ironically, meant to be healthful replacements for artery-clogging saturated fats such as butter and lard. But the process of making vegetable oil behave like butter made it as unhealthful as butter. New York and California have banned trans-fats in restaurant foods. Canada and Britain have considered it and countless food companies have dropped them as an ingredient. Read more at: http://news.yahoo.com/s/nm/20080411/hl_nm/cancer_breast_fats_dc;_ylt=Ar1chgc41n0t4J9tmmkXvMoQ.3QA