More than 11,000 women die out of the disease in the country every year.
Thus, Dr. Zhang declared that they did not meet a negative effect of soy on women who underwent hormone therapies. However, high amounts of isoflavone did not associate with higher mortality in women who did receive hormonal therapy. Alcohol, which normally forms part of a traditional Mediterranean diet, was excluded from the study because of its known links to breast cancer.
Now, a study has said that women following the Mediterranean diet, which is rich in fresh fruits, vegetables, lean proteins and healthy fats and low in refined sugars and saturated fats, are 40 percent less likely to develop ER-negative breast cancer.
Researchers from the UCLA Fielding School of Public Health examined the potential effect of a diet associated with chronic inflammation on breast cancer.
Each woman's diet was given an inflammatory score, using a method that links diet with inflammatory markers in the blood, and the women were then divided into 5 groups based on their score. But she warned that women must be aware of the symptoms of breast cancer and contact their GP with any concerns.
"Because breast cancer takes many years to arise, we were curious whether such a diet during the early phases of a woman's life is a risk factor", Michels said.
A popular diet could actually limit your risk of developing a deadly form of breast cancer, a recent study found.
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The study, in the International Journal of Cancer, was funded by the World Cancer Research Fund.
While the study categorized women in the highest quartile as those who consumed 1.5 milligrams or more of isoflavone per day-equivalent to a few dried soybeans-the authors caution that individuals tend to underestimate their food intake when filling out questionnaires. A weaker but significant association was also observed among women who did not undergo endocrine therapy treatment.
"For women with hormone receptor-negative breast cancer, soy food products may potentially have a protective effect", she said. However, Dr. Fang Zhang, the research director, cautioned that other studies suggest that the estrogen-like effects of isoflavones may decrease the effectiveness of hormone therapies used in the treatment of breast cancer.
Zhang, F. F., Haslam, D.
Breast cancer is often treated with surgery, radiation and chemotherapy. Cancer. Published online: March 6, 2017.
The Gerald J. and Dorothy R. Friedman School of Nutrition Science and Policy at Tufts University is the only independent school of nutrition in the United States.