Colostrum, the thick golden liquid that first comes out of a woman’s breasts after giving birth (or sometimes weeks before, as many freaked-out moms-to-be will tell you) is engineered to be low in fat but high in carbohydrates and protein, making it quickly and easily digestible to newborns in urgent need of its contents. (It also has a laxative effect that helps a baby pass its momentous first poop, a terrifying, black, tar-like substance called meconium.)
