Intended for healthcare professionals

Letters Fat and oil consumption

Nutritional survey data are inaccurate

BMJ 2014; 348 doi: (Published 14 May 2014) Cite this as: BMJ 2014;348:g3204
  1. Jack T Winkler, former professor of nutrition policy1
  1. 1London Metropolitan University, London N1 7AB, UK
  1. jtw{at}

Micha and colleagues’ paper is the latest of many articles attempting to investigate the diets of nations.1 Its extended description of data analysis techniques may bemuse many readers. Surely authors of such statistical sophistication know what they are talking about?

But this research suffers from the same fundamental flaw as all such studies—the poor quality of the primary data on individual food …

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