For years, investigators have known about a sure-fire way to put the brakes on aging and, in some cases, almost double lifespan. But are you willing to try it?

“To take wine into your mouth,” the American writer Clifton Fadiman once observed, “is to savor a droplet of the river of human history.” Hundreds of research studies offer evidence that wine, and perhaps all alcoholic beverages, offer powerful health benefits. But if a little is good, too much can be deadly. PDQhealth explores the delicate balance.