Premenopausal women who have breast-fed have a reduced risk of breast cancer, according to a study published in the January 13 New England Journal of Medicine.

Duration of breast-feeding and age at the time of first lactation were the biggest determinants of reduced breast-cancer risk, researchers said.

Researchers calculated that if women who did not breast-feed, or who breast-fed for fewer than three months, were to do so for four to 12 months, breast cancer among child bearing, premenopausal women could be reduced by 11 percent. If lactation continued for up to 24 months, breast cancer could be reduced by nearly 25 percent, researchers stated.

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