There’s little haze in the minds of most consumers these days when it comes to purple-colored foods. They clearly perceive the brightly colored dishes as exotic, nutritional powerhouses. “A lot of people equate antioxidants with purple” foods, says Eric Helms, owner of Juice Generation, a four-unit juice bar concept in New York City that opened nearly 10 years ago. Açaí and blueberries, in particular, are among the highly publicized purple produce widely marketed as having ...

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