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.

A 2009 Gallup poll found that 44% of Americans believe that God created human beings in their present form within the past 10,000 years. Many of them also think the human body is perfectly designed.

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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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