Who, What, Why: Why do people eat clay?

"I've discovered that clay is great for you because your body doesn't absorb it, and it apparently provides a negative charge, so it bonds to negative isotopes. And, this is crazy: it also helps clean heavy metals out of your body." She learned about it from an African taxi driver, she said. Some of her friends make clay toothpaste that you swallow instead of spit out. She cautioned that it was important to get it from a safe source.

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