Most of the gleaming steel tanks outside Fage's yogurt factory hold milk. One, however, holds the yogurt byproduct whey. Dan Charles/NPR hide caption

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Why Greek Yogurt Makers Want Whey To Go Away

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Tim Opper, of Cabot Cheese, inspects equipment that separates whey protein from sugar in the company's whey processing plant. Dan Charles/NPR hide caption

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You Can Thank A Whey Refinery For That Protein Smoothie

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