Diet quality--what is it and does it matter? - PubMed (original) (raw)
Review
. 2009 Dec;12(12):2473-92.
doi: 10.1017/S136898000900531X. Epub 2009 Apr 1.
Affiliations
- PMID: 19335941
- DOI: 10.1017/S136898000900531X
Review
Diet quality--what is it and does it matter?
Annika Wirt et al. Public Health Nutr. 2009 Dec.
Abstract
Objective: Measures of diet quality have evolved with a number of scoring indices currently in use. They are increasingly being used to examine epidemiological associations between dietary intake and nutrition-related health outcomes. The present review aims to describe current diet quality tools and their applications, and to examine the relationship between diet quality and morbidity and mortality.
Design: A search was conducted of MEDLINE, Cochrane, EMBASE, CINAHL and ProQuest electronic databases. Inclusion criteria were: English language; published from 2004 on; conducted in adult populations; longitudinal/cohort/case-control or cross-sectional study; included a theoretically defined measure of diet quality.
Results: A total of twenty-five indices of overall diet quality and/or variety were found, with components ranging from nutrients only to adherence to recommended food group servings, to variety within healthful food groups. The majority of studies reviewed had methodological weaknesses but demonstrated that higher dietary quality was consistently inversely related to all-cause mortality, with a protective effect of moderate magnitude. The associations were stronger for men and for all-cause and CVD mortality.
Conclusions: The limitations of both the indices and the studies that use them need to be considered when interpreting and comparing results. However, diet quality indices do appear to be able to quantify risk of some health outcomes, including biomarkers of disease and risk of CVD, some cancers and mortality. Further research is needed to improve the validity of these tools and to adapt them for use in clinical dietetic practice.
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