But if you are the mayor of New York, no such constraints apply. You can simply announce, as Michael Bloomberg did, that the city is starting a “nationwide initiative” to pressure the food industry and restaurant chains to cut salt intake by half over the next decade. Why bother with consent forms when you can automatically enroll everyone in the experiment?
And why bother with a control group when you already know the experiment’s outcome? The city’s health commissioner, Thomas R. Frieden, has enumerated the results. If the food industry follows the city’s wishes, the health department’s Web site announces, “that action will lower health care costs and prevent 150,000 premature deaths every year.”
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