Table 1.

Information to be extracted for each dietary assessment method

Dietary assessment method	Relevant information extracted
Food frequency (FFQ) questionnaire	• Number of food items
Non-weighed diet diary	• Number of days covered
Weighed records	• Number of days covered
24 hour recall	• Single or multiple recall • If multiple 24 hour recalls used what was the number of recalls? • Time interval between recalls
Biochemical marker	• Name of the biochemical marker?