Anthony A Laverty1, Thiago Hérick de Sá2, Carlos A Monteiro2, Christopher Millett3. 1. Department of Primary Care and Public Health, Imperial College London, London W6 8RP, UK a.laverty@imperial.ac.uk. 2. Department of Nutrition, School of Public Health, University of São Paulo, São Paulo, Brazil. 3. Department of Primary Care and Public Health, Imperial College London, London W6 8RP, UK.