Obesity? Big Feet? Blame Darwin

Evolution, the theory goes, guarantees survival to the fittest. But we can blame evolution for some of today's most pressing health problems, such as cancer, obesity, diabetes and cardiovascular disease.

And some body parts that provided a benefit at some time in human history pose challenges today—a phenomenon Texas Tech University geneticist Lewis I. Held Jr. calls "bislagiatt," an acronym for "but it seemed like a good idea at the time."

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