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Weight loss might reduce the risk of breast cancer, the study of over 60,000 postmenopausal women with no prior breast cancer and normal mammogram results. Their weight was checked before the the study and three years later. During an average follow-up of just over 11 years, about 3,000 new cases of invasive breast cancer were diagnosed in the group.
Women who lost 5 percent or more of their body weight had a 12 percent lower breast cancer risk than those whose weight remained the same, the findings showed. Weight gain of 5 percent or more was not associated with risk of breast cancer but but was associated with a 54 percent higher risk of triple negative breast cancer.
The study indicates that moderate, relatively short-term weight reduction was associated with a statistically significant reduction in breast cancer risk for postmenopausal women.