BRAZIL - APRIL 17: Baskets full of acai fruit from the riverbanks of the Amazon sit at the Acai Market in Belem, Brazil, on April 17, 2009. Rising U.S. sales of acai, a purple Amazon berry promoted as a "superfood" on Oprah Winfrey's Web site, are depriving Brazilian jungle dwellers of a protein-rich nutrient on which they've depended for generations. (Photo by Adriana Brasileiro/Bloomberg via Getty Images)
