Posting calorie information in fast food restaurants does not change the buying habits of consumers.
A 2010 Philadelphia law required fast food restaurants to post nutrition information on or near menu boards. Researchers from NYU collected receipts from more than 2,000 McDonald's and Burger King customers before and after the law went into effect.
They found no change in purchasing habits, or the frequency with which customers ate fast food. Many study participants said they didn't notice the calorie labels.
A similar study conducted in New York City had the same result.
Researchers say simply posting nutrition information isn't enough, more robust interventions are needed.
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