You can see how your microbiome is doing by enrolling in the American Gut Project, which is devoted to genetically mapping the microbiome, and paying $99 for a DNA analysis. For details, go to cofounder Jeff Leach's website, humanfoodproject.com.
Credit: Getty Images
The 2014 Adventure Issue
From Iceland's Highway 1 to Utah's Canyonlands, an epic itinerary for modern explorers.
Plus: Building a Bigger Action Hero
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Duke Lacrosse and the Fog of Scandal
How Thailand's Most Notorious Prison Became a Fight Club
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