The Divergent star dished on her consumption of it when she appeared on the David Letterman Show Monday, revealing why she likes to munch on it so much. "I do eat clay, yeah. Do you?" Shailene told David Letterman. "Clay is one of my favorites because if you look at indigenous cultures around the world, they eat clay almost daily."
"Clay binds to other material in your body and helps your body excrete those materials – that are not necessarily the best for you like toxins and heavy metals and what not," she went on.
"Have you heard of Metamucil?" David asked, with the audience erupting in laughter. Shailene went on to say she gets her clay online from a company called Mountain Rose Herbs, which sources their clay from Colorado. The thesp eats about a teaspoon of it each day and also makes her toothpaste from it.