Public health - time for pragmatism or knowledge production?

We have evidence on which to act, and inaction costs lives, argues Simon Capewell, Professor of Public Health and Policy, at the University of Liverpool. But Aileen Clarke, professor of public health and health services research at Warwick Medical School, says our understanding of the human behaviour that leads to unhealthy choices is still lacking Read the head to head http://www.bmj.com/content/360/bmj.k292