Research
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The largest improvement in diet quality was in schools, with the percentage with poor diet quality decreasing from 55.6% to 24.4%.
This indicates that school nutrition programs may be effectively improving the diet quality of students.
StrongSupportsmedium confidence
The largest improvement in diet quality was in schools, with the percentage with poor diet quality decreasing from 55.6% to 24.4% (P < .001 for trend).
Why this rating
Based on a large cross-sectional survey study design.
Source
Trends in Food Sources and Diet Quality Among US Children and Adults, 2003-2018
Junxiu Liu et al. · JAMA Network Open · 2021
DOI 10.1001/jamanetworkopen.2021.5262
cross-sectional · n=59862Cited 169×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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