About the Authors

Rostislav Chudnovskiy

Affiliation Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California, United States of America

Airlia Thompson

Affiliation Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California, United States of America

Kevin Tharp

Affiliation Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California, United States of America

Marc Hellerstein

Affiliation Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California, United States of America

Joseph L. Napoli

astahl@berkeley.edu (AS); jna@berkeley.edu (JLN)

Affiliation Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California, United States of America

Andreas Stahl

astahl@berkeley.edu (AS); jna@berkeley.edu (JLN)

Affiliation Department of Nutritional Sciences and Toxicology, Graduate Program in Metabolic Biology, University of California, Berkeley, California, United States of America

Competing Interests

The California Grapefruit Growers Cooperative provided financial support for this project. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials, and did not affect the outcome of these experiments.

Author Contributions

Conceived and designed the experiments: RC AT JLN AS. Performed the experiments: RC AT. Analyzed the data: RC AT JLN AS. Contributed reagents/materials/analysis tools: RC AT MH JLN AS. Wrote the paper: RC AT JLN AS. Analysis of grapefruit juice pH and caloric content: KT.