A new year, a new you? Heterogeneity and self-control in food purchases / Laurens Cherchye (University of Leuven), Bram De Rock (Universite Libre de Bruxelles and University of Leuven), Rachel Griffith (IFS and University of Manchester), Martin OConnell (Institute for Fiscal Studies (IFS)), Kate Smith (IFS and University College London), Frederic Vermeulen (University of Leuven, Universidad del Pacífico, and IZA) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, December 2017