“Fecal microbial transplants” treat someone’s unhealthy gut with poop from someone else’s healthy gut, and proponents of FMT claim it can help treat everything from IBS to autism. But if your doctor isn’t ready to fill you up with someone else’s poop, the internet will happily oblige. 

Guest: 

Luke Winkie, Slate staff writer who published “The Poop Broker.”

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