PSYC 4220 Chapter 5: 5
24 Feb 2019
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Lieberman offered the example of dysevolution as a result of excess. Agriculture and industrialization have revolutionized the way we produce food, he said, and for human bodies adapted to conditions of scarcity, the results can range from cavities to obesity. On the other side of the spectrum, dysevolution can also result from too little of something for instance, exercise. Growth and maintenance of bone and muscle require consistent use, said lieberman, whose lab studies skeletal biology (see head to toe, january-february 2011). His research has suggested that jaw size has decreased in the past few centuries as humans eat more soft, processed food. Rates of osteoporosis are on the rise, a fact lieberman attributes to declines in the physical activity necessary to build and maintain bone mass. Dysevolution can also result from conditions that are too new. Lieberman projected an image of a man sitting in a chair reading a book.
