Next Article in Journal
Nutrition in the Intensive Care Unit—A Narrative Review
Previous Article in Journal
Bone Mineral Density Changes during Weight Regain following Weight Loss with and without Exercise
Article

Development of a Portfolio Diet Score and Its Concurrent and Predictive Validity Assessed by a Food Frequency Questionnaire

1
Department of Nutritional Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
2
Clinical Nutrition and Risk Factor Modification Center, St. Michael’s Hospital, Toronto, ON M5C 2T2, Canada
3
Toronto 3D Knowledge Synthesis and Clinical Trials Unit, St. Michael’s Hospital, Toronto, ON M5C 2T2, Canada
4
School of Nutrition, Ryerson University, Toronto, ON M5B 2K3, Canada
5
College of Pharmacy and Nutrition, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
6
Department of Medicine, Dalla Lana School of Public Health, University of Toronto, Toronto, ON M5T 3M7, Canada
7
Leadership Sinai Centre for Diabetes, Mount Sinai Hospital, Toronto, ON M5G 1X5, Canada
8
Department of Medicine, Temerty Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
9
Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Toronto, ON M5B 1A6, Canada
10
Division of Endocrinology and Metabolism, Department of Medicine, St. Michael’s Hospital, Toronto, ON M5C 2T2, Canada
*
Author to whom correspondence should be addressed.
These authors contribute equally to this work.
Academic Editor: Megan A. McCrory
Nutrients 2021, 13(8), 2850; https://doi.org/10.3390/nu13082850
Received: 17 June 2021 / Revised: 6 August 2021 / Accepted: 17 August 2021 / Published: 19 August 2021
(This article belongs to the Section Nutrition Methodology & Assessment)
The Portfolio Diet, a plant-based portfolio of cholesterol-lowering foods, has been shown to reduce low-density lipoprotein cholesterol (LDL-C), and other cardiovascular risk factors, in randomized controlled trials (RCTs). It is not known if these beneficial effects translate to a lower incidence of cardiovascular disease (CVD). To support examinations between Portfolio Diet adherence and disease, a Portfolio Diet score (PDS) was developed and its predictive and concurrent validity was assessed within the Toronto Healthy Diet Study, a six-month RCT in overweight adults. Predictive validity was assessed using change in the PDS measured by food frequency questionnaire (FFQ) and concomitant change in LDL-C from baseline to six months using multiple linear regression, adjusted for potential confounders (n = 652). Concurrent validity was assessed in a subset of participants (n = 50) who completed the FFQ and a 7-day diet record (7DDR) at baseline. The PDS determined from each diet assessment method was used to derive correlation coefficients and Bland–Altman plots to assess the between-method agreement. The change in PDS was inversely associated with change in LDL-C (β coefficients: −0.01 mmol/L (95% confidence intervals (CIs): −0.02, −0.002; p = 0.02). The correlation between the PDS from the FFQ and 7DDR was 0.69 (95% CIs: 0.48, 0.85). The Bland–Altman plot showed reasonable agreement between the score from the FFQ and 7DDR. These findings indicate predictive validity of the PDS with lower LDL-C, and reasonable concurrent validity of the PDS as assessed by an FFQ against a 7DDR. View Full-Text
Keywords: portfolio diet; validity; diet index; dietary pattern portfolio diet; validity; diet index; dietary pattern
Show Figures

Figure 1

MDPI and ACS Style

Glenn, A.J.; Boucher, B.A.; Kavcic, C.C.; Khan, T.A.; Paquette, M.; Kendall, C.W.C.; Hanley, A.J.; Jenkins, D.J.A.; Sievenpiper, J.L. Development of a Portfolio Diet Score and Its Concurrent and Predictive Validity Assessed by a Food Frequency Questionnaire. Nutrients 2021, 13, 2850. https://doi.org/10.3390/nu13082850

AMA Style

Glenn AJ, Boucher BA, Kavcic CC, Khan TA, Paquette M, Kendall CWC, Hanley AJ, Jenkins DJA, Sievenpiper JL. Development of a Portfolio Diet Score and Its Concurrent and Predictive Validity Assessed by a Food Frequency Questionnaire. Nutrients. 2021; 13(8):2850. https://doi.org/10.3390/nu13082850

Chicago/Turabian Style

Glenn, Andrea J., Beatrice A. Boucher, Chloe C. Kavcic, Tauseef A. Khan, Melanie Paquette, Cyril W.C. Kendall, Anthony J. Hanley, David J.A. Jenkins, and John L. Sievenpiper. 2021. "Development of a Portfolio Diet Score and Its Concurrent and Predictive Validity Assessed by a Food Frequency Questionnaire" Nutrients 13, no. 8: 2850. https://doi.org/10.3390/nu13082850

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop