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Research Article

Energy Density, Portion Size, and Eating Occasions: Contributions to Increased Energy Intake in the United States, 1977–2006

  • Kiyah J. Duffey,

    Affiliation: Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

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  • Barry M. Popkin mail

    popkin@unc.edu

    Affiliations: Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America, Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

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  • Published: June 28, 2011
  • DOI: 10.1371/journal.pmed.1001050

About the Authors

Kiyah J. Duffey, Barry M. Popkin
Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
Barry M. Popkin
Carolina Population Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Corresponding Author

Email: popkin@unc.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Contributed reagents/materials/analysis tools: KJD BMP. ICMJE criteria for authorship read and met: KJD BMP. Agree with the manuscript's results and conclusions: KJD BMP. Wrote the first draft of the paper: KJD BMP. Study concept and design, acquisition of data, critical revision of the manuscript for important intellectual content, obtained funding, and study supervision: BMP KJD. Analysis and interpretation of data: KJD BMP. Drafting of the manuscript, statistical expertise, and administrative, technical, or material support: KJD BMP.