High unsaturated fat diets are linked to breast cancer, in both the quantity and quality of fat.
More fat cells produce more estrogen.
A high fat diet promotes an earlier menstrual cycle which leads to more estrogen exposure. Mice fed a high fat diet have offspring with a higher risk of breast cancer. In terms of quality, most of the fats we consume contain large amounts of organo-chlorides. Breast cancer cells have been demonstrated to grow in test tubes with these xenoestrogens. Exercise directly decreases estradiol absorption, improves immune response and relieves stress.