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International Journal of Epidemiology 2001;30:317-319
© International Epidemiological Association 2001


Theory and Methods

Commentary: Dietary diaries versus food frequency questionnaires—a case of undigestible data

Walter Willett

Departments of Nutrition and Epidemiology, Harvard School of Public Health, and the Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA. Public Health, 655 Huntington Ave, Boston, MA 02115, USA.

Correspondence: Walter Willett, Department of Nutrition, Harvard School of

In conducting studies of diet and disease risk, methods of measuring diet with sufficient validity to detect important associations are essential. Cost is also a critical factor because prospective studies, which are necessarily large, are desirable to avoid problems of selection and recall bias. Most investigators have converged to use some form of a food frequency questionnaire (FFQ) for this purpose, and the validity of this approach has been documented repeatedly by comparisons with more detailed methods, correlations with biochemical indicators of dietary factors, and the ability to predict risk of future disease.1,2 However, all methods of dietary assessment are imperfect, and quantification of measurement error is desirable both to . . . [Full Text of this Article]

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