"Sponsored Science" Strikes Again

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My e-mail inbox is flooded with copies of an op-ed from today's New York Times arguing that pigs running around outside have "higher rates" of Salmonella, toxoplasma, and, most alarming, trichina than pigs raised in factory farms. The writer, James McWilliams, is a prize-winning historian at Texas State San Marcos whose forthcoming book is about the dangers of the locavore movement to the future of food.

I put "higher rates" in quotation marks because that is not what the study measured. The study on which McWilliams based his op-ed is published in Foodborne Pathogens and Disease. The investigators actually measured "seropositivity" (antibodies) in the pigs' blood. But the presence of antibodies does not necessarily mean that the animals--or their meat--are infected. It means that the free-range pigs were exposed to the organisms at some point and developed immunity to them. The industrial pigs were not exposed and did not develop immunity to these microorganisms. But you would never know that from reading the op-ed. How come?

Guess who paid for the study? The National Pork Board, of course.

The Center for a Livable Future at Johns Hopkins has much to say about all this. My point, as always, is that sponsored studies are invariably designed in ways that produce results favorable to the sponsor. In this case, the sponsor represents industrial pork producers.

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Marion Nestle is a professor in the Department of Nutrition, Food Studies, and Public Health at New York University. She is the author of Food Politics, Safe Food, What to Eat, and Pet Food Politics. More

Nestle also holds appointments as Professor of Sociology at NYU and Visiting Professor of Nutritional Sciences at Cornell. She is the author of three prize-winning books: Food Politics: How the Food Industry Influences Nutrition and Health (revised edition, 2007), Safe Food: The Politics of Food Safety (2003), and What to Eat (2006). Her most recent book is Feed Your Pet Right: The Authoritative Guide to Feeding Your Dog and Cat. She writes the Food Matters column for The San Francisco Chronicle and blogs almost daily at Food Politics.

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