In the study, researchers from the American Cancer Society and Harvard T.H. Chan School of Public Health and others analyzed date from a large ongoing public health study called the Pooling Project of Prospective Studies of Diet and Cancer. The analysis involved more than 180,000 women aged 50 and older from 10 studies, looking at weight loss and breast cancer.
The results showed that women who lost 2 to 4.5 kg or about 5 to 10 pounds had a 13 percent lower risk of breast cancer compared to women with stable weight. Women who had a sustained weight loss of 10 to 20 pounds had a 16 percent lower risk and those who had a sustained weight loss of more than 20 pounds had a 26 percent lower risk compared to women with stable weight.
"Our results suggest that even a modest amount of sustained weight loss is associated with lower breast cancer risk for women over 50," said Lauren Teras, PhD, lead author of the study. "These findings may be a strong motivator for the two-thirds of American women who are overweight to lose some of that weight. Even if you gain weight after age 50, it is not too late to lower your risk of breast cancer."
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