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Lieberman examines energy balance-calories taken in vs. Thus we remained until the agricultural and industrial revolutions spurred population growth, changed diets, and introduced new infectious and chronic diseases-while little altering our hunter-gatherer anatomy and physiology. In time, humans spread across the globe in hunter-gatherer groups. The Evolution of the Human Head, 2011, etc.) writes authoritatively about the fossil record, crediting bipedalism as the driver that freed hands to learn new skills, enabled foraging for diverse diets and chasing prey, and ultimately built bigger brains. Lieberman (Human Evolutionary Biology/Harvard Univ. That is the core message of this massive review of where we came from and what ails us now. Six million years of biological evolution have produced a human body ill-adapted to the diets and lifestyles that cultural evolution has wrought since modern humans emerged.
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