Relative validity of a web-based food frequency questionnaire for patients with type 1 and type 2 diabetes in Denmark.

S M R Bentzen,V K Knudsen,B Ewers,T Christiensen

doi:10.1038/nutd.2016.40

S M R Bentzen, V K Knudsen + Show 2 more

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https://doi.org/10.1038/nutd.2016.40

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Abstract

Background:Diet has an important role in the management of diabetes. However, little is known about dietary intake in Danish diabetes patients. A food frequency questionnaire (FFQ) focusing on most relevant nutrients in diabetes including carbohydrates, dietary fibres and simple sugars was developed and validated.Objectives:To examine the relative validity of nutrients calculated by a web-based food frequency questionnaire for patients with diabetes.Design:The FFQ was validated against a 4-day pre-coded food diary (FD). Intakes of nutrients were calculated. Means of intake were compared and cross-classifications of individuals according to intake were performed. To assess the agreement between the two methods, Pearson and Spearman's correlation coefficients and weighted kappa coefficients were calculated.Subjects:Ninety patients (64 with type 1 diabetes and 26 with type 2 diabetes) accepted to participate in the study. Twenty-six were excluded from the final study population.Setting:64 volunteer diabetes patients at the Steno Diabetes Center.Results:Intakes of carbohydrates, simple sugars, dietary fibres and total energy were higher according to the FFQ compared with the FD. However, intakes of nutrients were grossly classified in the same or adjacent quartiles with an average of 82% of the selected nutrients when comparing the two methods. In general, moderate agreement between the two methods was found.Conclusion:The FFQ was validated for assessment of a range of nutrients. Comparing the intakes of selected nutrients (carbohydrates, dietary fibres and simple sugars), patients were classified correctly according to low and high intakes. The FFQ is a reliable dietary assessment tool to use in research and evaluation of patient education for patients with diabetes.

Highlights

In Denmark, patients with diabetes are recommended to eat a healthy diet corresponding to the food-based dietary guidelines for the general Danish population
Among several methods to assess dietary intake, food frequency questionnaires (FFQs) are commonly used, since selfadministered FFQs are less expensive and less time-consuming for participants and researchers compared with other dietary assessment methods such as 24-h recalls, food diaries or food records.[5]
Comparison of intakes according to FFQ and food diary (FD) showed a statistically significant difference in the reported energy intake for carbohydrates and dietary fibres, with a higher reported intake of both carbohydrates and dietary fibres according to the FFQ (Table 3)

Summary

Introduction

In Denmark, patients with diabetes are recommended to eat a healthy diet corresponding to the food-based dietary guidelines for the general Danish population. Both quantity and quality of carbohydrates influence blood glucose postprandial levels, with the total intake of carbohydrates being the primary predictor of glycemic response.[1] in the dietary management of patients with diabetes, dieticians focus on assessing and educating patients in adjusting carbohydrate intakes, including amounts and types (for example, dietary fibres and simple sugars) of carbohydrates. Comparing the intakes of selected nutrients (carbohydrates, dietary fibres and simple sugars), patients were classified correctly according to low and high intakes. The FFQ is a reliable dietary assessment tool to use in research and evaluation of patient education for patients with diabetes

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Conclusion