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Diet image: a new perspective on the food-frequency questionnaire
1Nutritional Sciences Program, School of Public Health and Community Medicine, University of Washington, Seattle 98195, USA.
Nutrition Reviews
|November 27, 2001
Summary
Food-frequency questionnaires (FFQs) may not accurately estimate absolute fat and cholesterol intake compared to diet records. FFQs might reflect subjective attitudes about habitual diets rather than precise recall.
Area of Science:
- Epidemiologic research
- Nutritional science
- Dietary assessment methods
Background:
- Food-frequency questionnaires (FFQs) are widely used in epidemiologic studies for dietary intake assessment.
- Concerns persist regarding the accuracy and reliability of FFQs in capturing precise nutrient consumption.
Purpose of the Study:
- To evaluate the accuracy of food-frequency questionnaires (FFQs) in estimating absolute fat and cholesterol intake.
- To compare FFQ data with diet records under controlled dietary conditions.
Main Methods:
- Volunteers consumed three diets with varying fat content over a six-week period.
- Dietary intake was assessed using both food-frequency questionnaires and diet records.
Main Results:
- Food-frequency questionnaires yielded less reliable estimates of absolute fat and cholesterol consumption compared to diet records.
- The study suggests FFQs may capture subjective perceptions of habitual diet rather than precise recall.
Conclusions:
- The validity of food-frequency questionnaires for absolute nutrient quantification remains questionable.
- FFQs may function as a measure of attitude towards diet rather than a precise recall tool, limiting absolute validation.