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Archeological evidence suggests that most civilizations, going back to man’s earliest roots, have engaged in clay consumption.  Johns and Duquette, two of the most noted researchers on geophagy (or “earth eating”), have concluded that the body is trying to meet a nutritional need that has otherwise gone unmet. Several clinical studies have shown that the eating of clay, or even the body’s response to the scent of clay in warm moist soil, has been connected to specific mineral deficiencies.  By introducing select minerals to test subjects, clinical scientists were able to change the subjects’ dietary cravings.