1. Center for Science in the Public Interest, Washington, DC 20005, USA
2. Center for Community Health, University of California San Diego, La Jolla, CA 92037, USA
3. Healthy Food America, Seattle, WA 98122, USA
4. Division of General Internal Medicine, University of California San Francisco, San Francisco, CA 94143, USA
5. School of Public Health, University of Washington, Seattle, WA 98195, USA