More on the Breastfeeding Controversy

So there's now more evidence that breastfeeding isn't, as the headline says, "as beneficial as once thought." It's starting to sound like the benefits of breastfeeding may have more to do with hormonal factors than with the milk itself.
Makes me wonder if the reported reduction in breast and uterine cancers associated with breastfeeding is also related to something else, like lifestyle or hormones.