Intended for healthcare professionals

Letters Happiness networks

Know your friends

BMJ 2009; 338 doi: (Published 28 January 2009) Cite this as: BMJ 2009;338:b293
  1. Jonathan A Mellon, student1
  1. 1St Anne’s College, University of Oxford, Oxford OX2 6HS
  1. jonathan.mellon{at}

    The findings of Fowler and Christakis, that happiness seems to spread through social networks, arise from an innovative use of the data of the Framingham Heart Study.1 However, the question still remains to what extent apparent contagion of happiness to second degrees of separation could in fact …

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