from bloomberg: Rising U.S. sales of açaí, a purple Amazon berry promoted as a “superfood” on Oprah Winfrey’s Web site, are depriving Brazilian jungle dwellers of a protein-rich nutrient they’ve relied on for generations. U.S. consumers are turning a “a typical poor people’s food into something like a delicacy,” said Oscar Nogueira, who specializes in the fruit at Embrapa, Brazil’s agricultural research company.