The clay diet — it’s not a trend you hear about every day.

Shailene Woodley, however, seems quite a bit more familiar with the term. The 22-year-old star of Divergent and The Fault in Our Stars told David Letterman that she does, in fact, eat clay.

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“Clay binds to other materials in your body and helps your body excrete those materials – that are not necessarily the best for you,” Woodley claimed.

Woodley eats a daily teaspoon of clay from a company that sources it from Colorado, she told Letterman. She also uses the clay in her toothpaste.

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-Lia Rosalsky, CW Philly