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- W2105349766 abstract "Americans spend >100 billion dollars on restaurant fast food each year; fast food meals comprise a disproportionate amount of both meat and calories within the U.S. diet. We used carbon and nitrogen stable isotopes to infer the source of feed to meat animals, the source of fat within fries, and the extent of fertilization and confinement inherent to production. We sampled food from McDonald's, Burger King, and Wendy's chains, purchasing >480 servings of hamburgers, chicken sandwiches and fries within geographically distributed U.S. cities: Los Angeles, San Francisco, Denver, Detroit, Boston, and Baltimore. From the entire sample set of beef and chicken, only 12 servings of beef had delta(13)C < -21 per thousand; for these animals only was a food source other than corn possible. We observed remarkably invariant values of delta(15)N in both beef and chicken, reflecting uniform confinement and exposure to heavily fertilized feed for all animals. The delta(13)C value of fries differed significantly among restaurants indicating that the chains used different protocols for deep-frying: Wendy's clearly used only corn oil, whereas McDonald's and Burger King favored other vegetable oils; this differed from ingredient reports. Our results highlighted the overwhelming importance of corn agriculture within virtually every aspect of fast food manufacture." @default.
- W2105349766 created "2016-06-24" @default.
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- W2105349766 date "2008-11-18" @default.
- W2105349766 modified "2023-09-23" @default.
- W2105349766 title "Carbon and nitrogen stable isotopes in fast food: Signatures of corn and confinement" @default.
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- W2105349766 doi "https://doi.org/10.1073/pnas.0809870105" @default.
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