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Dietary


The CARET Food Frequency Questionnaire (FFQ) was designed to be especially sensitive to the measurement of fruits and vegetables and their nutrients, such as carotenoids. This FFQ is divided into three sections: (1) seven adjustment questions on types of foods and preparation techniques (e.g., usual types of fat used in cooking and at the table), which are used to alter how the analysis software calculates the fat and fiber content of specific foods; (2) 110 line items with questions on the frequency of use over the last year (from “never or less than once a month” to “2+ per day” for foods and “6+ per day” for beverages) and portion size (small, medium, or large, compared to the stated medium portion size); and (3) two summary questions on the usual consumption of fruits and vegetables, which are necessary to reduce the measurement error biased toward overreporting food intake. The nutrient database is derived from the University of Minnesota Nutrition Coordinating Center (NCC) database and included the 1998 USDA-NCC carotenoid database for U.S. foods.
 

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