Food frequency questionnaire (FFQ) is a questionnaire used to obtain frequency and, in some cases, portion size information about food and beverage consumption over a specified period of time, typically the past month  or year. FFQs are a common dietary assessment tool used in large epidemiologic studies of diet and health. Examples of usage include assessment of intake of vitamins and other nutrients, assessment of the intake of toxins, and estimating the prevalence of dietary patterns such as vegetarianism . It is an example of a dietary assessment tool .
Food frequency questionnaire (FFQ) is a dietary assessment tool delivered as a questionnaire to estimate frequency and, in some cases, portion size information about food and beverage consumption over a specified period of time, typically the past month , three months, or year. FFQs are a common dietary assessment tool used in large epidemiologic studies of diet and health. Examples of usage include assessment of intake of vitamins and other nutrients, assessment of the intake of toxins, and estimating the prevalence of dietary patterns such as vegetarianism .
R
questionnaire used to obtain
dietary assessment tool delivered as a questionnaire to estimate
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, three months,
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. It is an example of a dietary assessment tool