My friend Marina attaches the suction cup of the breast pump to her nipple and presses the button. The mechanical noise from the pump mixes with the sounds of advertising executives having lunch. Marina has a two-year-old daughter who's starting to wean, and I've come by her office to have lunch with her and drink some of her breast milk. Breast milk is food for babies, of course, but if some—not necessarily reliable—media outlets are to believed, it's also a life-affirming, youth-restoring nectar for adults. There are claims that drinking it can improve your skin , work wonders for your immune system, help build muscle , and can even be used as contact solution. And, apparently, it tastes great too.