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The present-day Gila River in the Gila Box Riparian National Conservation Area in southeast Arizona. 

Both nature and nurture affect human obesity. For some people, and for some populations, the genetic tendency to become obese is not fulfilled because of their environment, the circumstances of their lives. But when those circumstances change, the genetic potential may be realised quickly, and lead to the medical issues that follow from obesity. An example that starkly illustrates this comes from the sunbaked desert south of Phoenix, Arizona.Read the rest “The Gila River People, Victims of Modernity”