A new study published in the JAMA Internal Medicine, by the University of Navarra in Pamplona and CIBEROBN in Madrid, Spain, has revealed that supplementing a Mediterranean diet with extra virgin olive oil reduces the risk of breast cancer in Spanish women.
The study consisted of comparing the impact of consuming extra virgin olive oil, (EVOO), and a low fat diet on 4,282 women. Study participants in the two intervention groups were given extra virgin olive oil, (one liter per week for the participants and their families) or mixed nuts (30 grams per day: 15 grams of walnuts, 7.5 grams of hazelnuts and 7.5 grams of almonds).
Women were randomly assigned to the Mediterranean diet supplemented with EVOO (n=1,476), the Mediterranean diet supplemented with nuts (n=1,285) or the control diet with advice to reduce their dietary intake of fat (n=1,391).
The scientist indicate that women who consumed a Mediterranean diet supplemented with EVOO showed a 68 percent lower risk of malignant breast cancer compared to the control diet group. Women eating a Mediterranean diet supplemented with nuts showed a nonsignificant risk reduction compared with women in the control group.
“The results of the PREDIMED trial suggest a beneficial effect of a MeDiet [Mediterranean diet] supplemented with EVOO in the primary prevention of breast cancer. Preventive strategies represent the most sensible approach against cancer. The intervention paradigm implemented in the PREDIMED trial provides a useful scenario for breast cancer prevention because it is conducted in primary health care centers and also offers beneficial effects on a wide variety of health outcomes. Nevertheless, these results need confirmation by long-term studies with a higher number of incident cases,” the authors conclude.
Mediterranean diet and invasive breast cancer risk among women at high cardiovascular risk in the PREDIMED trial, Miguel A. Martinez-Gonzalez et al., JAMA Internal Medicine, doi:10.1001/jamainternmed.2015.4838, published online 14 September 2015.