A food frequency questionnaire is designed to obtain qualitative information about food consumption; this does not provide quantitative data on food or nutrient intake.
FFQ has two aspects
A list of food
A set of frequency of use of particular foods
It may be a focused questionnaire focusing on specific groups of food/particular foods/occasionally consumed foods.
Aim is to assess frequency with which certain food items of food groups are consumed during a specific time period. (Example: Daily, weekly, monthly, yearly)
Questionnaire should be simple, with a defined food categories open ended questions should be avoided.
Often this method is used by scientists to study association between dietary habits and disease.
Participants