For both pre- and postmenopausal breast cancers, the many studies looking on whether dietary fat matters has resulted in no clear conclusions. Now comes a study from Italy suggesting that it does for certain types of breast tumors, including the most common type.
The study suggests that consuming high amounts of total fat, and saturated fats specifically, links to increased risk of breast tumors fueled by the hormones estrogen and progesterone. About three quarters of US breast tumors are estrogen-receptor positive (ER+). The majority of those also grow in response to progesterone.
The increased risk was most pronounced for high amounts of saturated fat, the type of fat from burgers, butter and primarily animal sources.
Here’s the study abstract, published in the Journal of the National Cancer Institute.
This is one study, and it will be added to the body of evidence on breast cancer prevention in AICR/WCRF’s Continuous Update Project (CUP). In the latest CUP report, there was not enough evidence on total dietary fat to make a conclusion for pre- or postmenopausal cancers. Continue reading