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Southwest Airlines passengers consistently praise the company for serving good food on its flights — but in fact, the airline doesn’t serve any food at all. Does this have implications for a majority of our dietary data, making that data, which relies on self-reporting, suspect? Some researchers say yes, including David Allison, director of the Nutrition Obesity Research Center at the University of Alabama at Birmingham, who relayed this story at a conference. After all, if people don’t accurately recall if they ate, should we trust their memories of what they ate?