Narrative reviewindependent cross-checkabstract checked I-UPF-104 standard review
Experts debate the ultra-processed food concept
Does the concept of "ultra-processed foods" help inform dietary guidelines, beyond conventional classification systems? Debate consensus.
Overview
Astrup A et al.. Am J Clin Nutr 2022 · PMID 36253965 · DOI 10.1093/ajcn/nqac230
Two leading nutrition scientists agreed that processing matters but disagreed on whether the UPF definition is clear enough.
Does the study support the specific claim? No · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
To summarise a debate on the UPF concept.
- How was the study done?
Consensus statement after a published debate.
- How many people, animals or samples were studied?
Not applicable.
- What was actually found?
Agreement that processing matters; disagreement on definition and usefulness.
- How large was the observed effect?
Not applicable.
- What do the results mean in everyday life?
'Ultra-processed' is a useful but debated label.
- What are the study's limitations?
Opinion only.
- What does it say about Elawady's specific claim?
Contradicts 'precise category' in C-UPF-01.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Does not decide who is right.
Scientific in-depth review
1. Full reference
- Authors
- Astrup A et al.
- Journal
- Am J Clin Nutr
- Year
- 2022
- Identifier
- PMID 36253965 DOI 10.1093/ajcn/nqac230
- Verification
- verified – PubMed efetch 2026-10-26; Crossref works API 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
No COI statement in PubMed record
2. Research question
Does the UPF concept help inform dietary guidelines beyond conventional classifications?
3. Study design and population
- Study design
- Narrative review – Debate consensus statement (editorial)
- Population
Not applicable
- Country
Not applicable
- Period
2022
- Sample size
Not applicable
- Inclusion and exclusion criteria
Not applicable
4. Methods and endpoints
- Exposure / intervention
Nova UPF concept
- Comparator
Nutrient-based classification
- Endpoints
Not applicable
- Statistical methods
Not applicable
5. Actual results
- Results
Both sides agree that food processing affects health and diet quality; they disagree on the significance of ultra-processing as defined by Nova. YES position: concept well founded, clear and supported by systematic associations persisting after control for nutrients. NO position: concept poorly defined, gives rise to misclassification, lacks clear mechanisms, obesity associations likely confounded; adds no value to nutrient profiling.
- Absolute risks
Not applicable
- Authors' conclusion
Experts disagree on the definition and usefulness of the UPF category.
6. Strengths
- Presents both expert positions
7. Weaknesses
- Opinion; no new data
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- not assessable
- Rationale
Expert debate.
9. Assessment of the statistical interpretation
Not applicable.
10. Relevance to the specific claim
Documents that the precision and usefulness of the UPF category are scientifically contested.
11. Independent contrary findings
Monteiro's YES position.
12. Transferability to Germany and Europe
Applicable.
13. Overall methodological judgement
Shows that 'precise scientific category' overstates consensus.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | unknown |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Refined definitions.
15. Linked fact checks
- 'Ultra-processed food' is a precise scientific category (NOVA group 4); a product is ultra-processed if its label lists any ingredient you would not have in your kitchen. – Studies contradicting or limiting the claim