R R Weir1, E L Carson1, M S Mulhern1, E Laird2, M Healy3, L K Pourshahidi1. 1. Northern Ireland Centre for Food and Health (NICHE), University of Ulster, Coleraine, UK. 2. Institute of Molecular Medicine, School of Medicine, Trinity College, Dublin, Ireland. 3. The Department of Clinical Biochemistry, St James's Hospital, Dublin, Ireland.
Abstract
BACKGROUND: Dietary sources of vitamin D (both natural and fortified) are increasingly contributing to consumers' vitamin D intake and status. Therefore, the present study aimed to validate a vitamin D food frequency questionnaire (FFQ) for the assessment of habitual vitamin D intake. METHODS: A total of 49 apparently healthy consenting adults (aged 18-64 years) from the local community were sampled at the end of winter. Dietary intakes were recorded using a 4-day weighed food record (4d-WFR) and a 17-item FFQ based on foods known to contribute to dietary vitamin D intake. Fasting vitamin D status was quantified by serum 25-hydroxyvitamin D [25(OH)D] using liquid chromatography tandem mass spectrometry. The method of triads was applied using these three measurements to determine the overall validity of the FFQ. RESULTS: Vitamin D intakes from 4d-WFR ranged between 0.42 and 31.65 μg day(-1), whereas intakes determined from the FFQ ranged from 1.03 to 36.08 μg day(-1). Serum 25(OH)D concentrations ranged between 12.89 and 279.00 nmol L(-1). The mean (SD) difference between the FFQ and 4d-WFR was +1.62 ( 3.86). There were strong correlations between the vitamin D intake estimated by the FFQ and that from the 4d-WFR (r = 0.562) and also with serum 25(OH)D concentrations (r = 0.567). Vitamin D intake estimated from the 4d-WFR was also strongly correlated with serum 25(OH)D concentrations (r = 0.411). The overall validity coefficient calculated using the method of triads was high (0.881). CONCLUSIONS: The vitamin D FFQ has been validated for use in future studies aiming to assess habitual vitamin D intake.
BACKGROUND: Dietary sources of vitamin D (both natural and fortified) are increasingly contributing to consumers' vitamin D intake and status. Therefore, the present study aimed to validate a vitamin D food frequency questionnaire (FFQ) for the assessment of habitual vitamin D intake. METHODS: A total of 49 apparently healthy consenting adults (aged 18-64 years) from the local community were sampled at the end of winter. Dietary intakes were recorded using a 4-day weighed food record (4d-WFR) and a 17-item FFQ based on foods known to contribute to dietary vitamin D intake. Fasting vitamin D status was quantified by serum 25-hydroxyvitamin D [25(OH)D] using liquid chromatography tandem mass spectrometry. The method of triads was applied using these three measurements to determine the overall validity of the FFQ. RESULTS:Vitamin D intakes from 4d-WFR ranged between 0.42 and 31.65 μg day(-1), whereas intakes determined from the FFQ ranged from 1.03 to 36.08 μg day(-1). Serum 25(OH)D concentrations ranged between 12.89 and 279.00 nmol L(-1). The mean (SD) difference between the FFQ and 4d-WFR was +1.62 ( 3.86). There were strong correlations between the vitamin D intake estimated by the FFQ and that from the 4d-WFR (r = 0.562) and also with serum 25(OH)D concentrations (r = 0.567). Vitamin D intake estimated from the 4d-WFR was also strongly correlated with serum 25(OH)D concentrations (r = 0.411). The overall validity coefficient calculated using the method of triads was high (0.881). CONCLUSIONS: The vitamin D FFQ has been validated for use in future studies aiming to assess habitual vitamin D intake.
Authors: Dominique Ulrike Glatt; Emeir McSorley; L Kirsty Pourshahidi; Raquel Revuelta Iniesta; Jane McCluskey; Laura Beggan; Mary Slevin; Nigel Gleeson; Diego F Cobice; Sara Dobbin; Pamela J Magee Journal: Nutrients Date: 2022-02-14 Impact factor: 5.717
Authors: D Enette Larson-Meyer; Corey S Douglas; Joi J Thomas; Evan C Johnson; Jacqueline N Barcal; Jenna E Heller; Bruce W Hollis; Tanya M Halliday Journal: Nutrients Date: 2019-11-11 Impact factor: 5.717