Assessing the association between diet and cancer was a priority of this study, requiring an accurate means of classifying people according to aspects of their diet.
Since the early 1980s the food frequency questionnaire (FFQ) has been the method of choice for large epidemiological studies. When the Melbourne Collaborative Cohort Study began, there was no suitable, validated FFQ that covered the breadth of dietary exposures expected in the MCCS participants, so an FFQ was developed specifically.