Women who exercised regularly had a smaller chance of getting breast cancer than women who didn’t take regular exercise. The women who exercised the most were the least likely to get breast cancer. Compared with those who exercised the least, the most active women (those who exercised for about an hour a day) had a 12 percent lower chance of getting breast cancer.
Exercising can reduce women’s chances of getting breast cancer. But this preventive effect seems to be cancelled out in women who use hormone replacement therapy (HRT).
What do we know already?
Breast cancer is the most common cancer in women. Although rare in young women (only 1 in 2,000 women under 30 get breast cancer), women over the age of 70 years have a 1 in 13 chance of getting the disease.
Previous studies have suggested that women who take regular exercise might be less likely to get breast cancer. But it hasn’t been clear just how big the preventive effect of exercise might be.
We also know that taking hormone replacement therapy (HRT) increases women’s chances of breast cancer. Many women take HRT after they stop having monthly periods to help control symptoms caused by the menopause, such as hot flushes, weight gain, and depression. In some women, the…
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