Intended for healthcare professionals

Letters Commuting and incident disease

Benefits of active commuting—causality matters

BMJ 2017; 357 doi: (Published 19 May 2017) Cite this as: BMJ 2017;357:j2425
  1. David Colquhoun, research professor
  1. University College London, London, UK
  1. d.colquhoun{at}

Although the paper by Celis-Morales and colleagues on active commuting has the usual token nod to the problem of causality, it is written as though it shows that cycling …

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