TV

Shailene Woodley gives Letterman the dirt on eating clay

May 6, 2014 at 1:03 PM ET

Actress Shailene Woodley's alternative views on diet and beauty are well documented, but Monday night on "Late Show With David Letterman," she was able to expand on her thoughts regarding eating clay.

Letterman was genuinely interested in where the young star of "The Fault In Our Stars" gets her clay and why she ingests it.

"A few years ago, I had a massive heart surgery and was clinically dead for 30 days," Letterman said. "So I'm always interested in what I can do to make myself, in a natural way, healthier."

Woodley, 22, explained, as she has previously, that any New York City taxi driver could admit to the benefits of clay. "Clay is one of my favorites because if you look at indigenous cultures around the world, people are eating clay almost daily. It's just a part of their diet."

"Tell us the difference between clay and dirt," Letterman said to laughs from the audience.

"That's a great question," Woodley said. "Um, I think dirt is ... they're made from different matter. It's a different earth material. I'm not smart enough to answer that question."

But when Woodley admitted that she makes her toothpaste out of clay, Letterman said, "Well now that, that's not a problem." And Woodley replied sarcastically, "That makes total sense! That's not weird at all."

Woodley further explained that clay is supposed to "bind" to other materials in your body like toxins and heavy metals and help you excrete those materials.

Letterman finally asked, simply, "Have you heard of Metamucil?"

"The Fault In Our Stars" is the latest TODAY Book Club pick, and the film opens in theaters June 6.

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