Actress Shailene Woodley has been known to forage for herbs and promote natural living, and told David Letterman that eating clay is amazing.
The "Divergent" star says it helps your body “excrete materials.”
Letterman had a hard time wrapping his head around that one.
"Clay binds to other materials in your body and helps your body excrete those materials that aren't necessarily the best for you," she said.
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Woodley claims indigenous peoples from around the world eat clay as a part of their diet. She said she eats about a teaspoon a day and makes her toothpaste out of it.
Take note that few medical experts are touting the benefits of eating clay.