Mixed
Higher overall diet quality, as measured by adherence to national dietary guidelines or specific scoring indices (e.g., HEI, MDS), is consistently associated with a reduced risk of all-cause mortality, cardiovascular disease (CVD), and certain cancers.
Adhere to established national dietary guidelines by focusing on the quality and variety of your entire diet rather than isolating single nutrients. Higher adherence to these patterns (measured by indices like HEI or MDS) is consistently linked to lower risks of death, heart disease, and cancer. Prioritize fruits, vegetables, whole grains, and healthy fats while limiting processed foods and excess saturated fats.
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.
Why this rating
The review includes 28 studies, mostly observational/cohort, with noted methodological weaknesses and potential confounding, but consistent inverse associations.
Source
Diet quality – what is it and does it matter?
Annika Wirt et al. · Public Health Nutrition · 2009
DOI 10.1017/s136898000900531x
Related findings · Mixed
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This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →