Many health conditions that we contemporary humans consider to be unavoidable ills are actually not normal occurrences in human existence—common, but not normal. Consider acne vulgaris, a skin disorder affecting more than 90 percent of the western world, and malocclusion, a common misalignment of the upper and lower jaw. Only quite recently in our evolutionary history did these disorders became common. Among hunter-gatherers, they are rare.2, 4, 15

Scientific evidence suggests that this may also be the

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