Table 4.

Characteristics of dietary assessment tool

	Characteristics	Number of food items
FFQ	Retrospective, usually concerning the previous year, both quantitative and semi-quantitative versions exist	List of predefined food items and food groups; usually < 300
Diet recall	Retrospective, usually previous 24 h or 48 h	Individually based the food intake recorded by the participant; open-ended; > 1000 items
Dietary record	Filled in during actual food intake, both weighted and unweighted	Individually based the food intake recorded by the participant; open-ended; > 1000 items