“When we come out of the womb, we make our way to the breast. We enter the world knowing we’re mammals, with milk on our minds.
But even as grown-ups, we have never known exactly what’s in that milk—or, as strange as it may sound, what the point of it is. For decades, milk was thought of strictly in terms of nutrients, which makes sense—milk is how a mother feeds her baby, after all. But providing nutrients turns out to be only part of what milk does. And it might not even be the most important part…”