Letters Fruit and vegetable consumption and risk of breast cancer

Poor quality data from diet studies may dilute better quality evidence

BMJ 2016; 354 doi: https://doi.org/10.1136/bmj.i4219 (Published 15 August 2016) Cite this as: BMJ 2016;354:i4219
  1. George D Henderson, research associate
  1. Human Potential Centre, Auckland University of Technology, Auckland, New Zealand
  1. puddleg{at}gmail.com

The hypothesis behind Farvid and colleagues’ study,1 that cancer risk is modified early in life by micronutrients and other factors, is plausible. However, the data collection method—nostalgic re-creation of adults’ childhood diet—invites respondents to invent data.

I vaguely remember vegetables I ate in adolescence, in meals my mother cooked, but I can’t accurately recall fruit consumption. Yet the exclusion criteria …

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