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6. Breastfeeding

It has been shown in a number of studies that the risk of breast cancer is reduced in women who breastfeed. The reason is because a breastfeeding woman produces higher levels of the hormone prolactin, which lowers the levels of estrogen.

According to an analysis of 47 studies in 30 countries, the longer a woman breastfeeds over a lifetime, the more protected she is against breast cancer.

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