The world is getting fatter - but it might not be because we're eating more calories
New research looks at the reasons behind increasing obesity levels - and suggests it's not necessarily increased calorie consumption that's to blame.
Melanie Luhrmann is a Senior Lecturer in Economics at Royal Holloway, University of London, and a Research Associate at the Institute for Fiscal Studies. She works on applied microeconomics and economic policy. Her recent research focuses on public economics, consumer behaviour and public health.