1 Centre for Food Policy, City, University of London, London EC1R 1UW, UK. Electronic address: corinna.hawkes@city.ac.uk.
2 International Food Policy Research Instititute, Washington, DC, USA.
3 Childhood Nutrition Research Centre, Population, Policy and Practice Research and Teaching Programme, UCL Great Ormond Street Institute of Child Health, London, UK.
4 Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA.
5 Department of Nutrition ad Food Safety, World Health Organization, Geneva, Switzerland.