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American Journal of Clinical Nutrition, Vol. 70, No. 3, 422A-422, September 1999
© 1999 American Society for Clinical Nutrition

Letters to the Editor

Reply to M Tseng

Frank B Hu and Walter C Willett

Department of Nutrition, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115

Dear Sir:

We thank Tseng for her interest in our paper on validation studies of dietary patterns assessed with a food-frequency questionnaire (1). We agree that there is no gold standard for assessing dietary patterns. Nevertheless, the consistency of major dietary patterns assessed with food-frequency questionnaires and multiple, weekly dietary records suggests the usefulness of factor-analytic approaches for assessing dietary patterns. More importantly, dietary patterns were reasonably correlated with plasma biochemical measures of cardiovascular disease and nutrient intakes, further suggesting the validity of the method. The ultimate test of validity, however, lies in whether dietary patterns can independently predict disease outcomes. Analyses are underway to examine the relation between major dietary patterns assessed with food-frequency questionnaires and the incidence of cardiovascular disease.

REFERENCES

  1. Hu FB, Rimm E, Smith-Warner SA, et al. Reproducibility and validity of dietary patterns assessed with a food-frequency questionnaire. Am J Clin Nutr 1999;69:243–9.[Abstract/Free Full Text]




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