School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin, Ireland. School of Agriculture and Food Science, University College Dublin, Dublin, Ireland. Section of Nutrition and Metabolism, International Agency for Research on Cancer, Lyon, France. Clinical Trial Service Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK. Department of Genetics and Computational Biology, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia. Section of Nutrition and Metabolism, International Agency for Research on Cancer, Lyon, France. murphyn@iarc.fr.