Up until the 1960s, poor people ate healthier food than well-off whites, and poor African Americans had healthier diets than whites. By the 1990s, well-off whites had adopted the healthier diets, and poor Americans had started picking up the bad eating habits of the rich -- "Cheeseburger, cheeseburger, chips. No Coke, Pepsi." NPR's Joanne Silberner reports.
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