Research
Energy balance
Few companies in the US reduced portion sizes of ultra-processed foods since 2002.
Practitioners should be aware that portion sizes of ultra-processed foods have not decreased significantly, which may impact dietary recommendations.
StrongRefutesmedium confidence
Few companies in our sample reduced portion sizes since 2002.
Why this rating
The study compares current and past portion sizes based on manufacturer data.
Source
Portion Sizes of Ultra-Processed Foods in the United States, 2002 to 2021
Lisa R. Young et al. · American Journal of Public Health · 2021
DOI 10.2105/ajph.2021.306513
otherCited 30×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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