Narrative reviewindependent cross-checkabstract only checked I-UPF-03 standard review
A critical view of ultra-processed food research
Ultra-processed foods in human health: a critical appraisal.
Overview
Gibney MJ et al.. Am J Clin Nutr 2017 · PMID 28793996 · DOI 10.3945/ajcn.117.160440
Critics argue the UPF category is too broad and adds little beyond nutrients.
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?
Critique of NOVA framework.
- How was the study done?
Critical commentary.
- How many people, animals or samples were studied?
Not applicable; Not applicable
- What was actually found?
Argues no evidence that UPF are hyperpalatable/quasi-addictive; EU/US data do not show UPF-dominated diets are low in micronutrients; NOVA definition too broad for food-based dietary guidelines; little advantage over nutrient-based epidemiology.
- How large was the observed effect?
Not applicable
- What do the results mean in everyday life?
The UPF concept is debated.
- What are the study's limitations?
Opinion piece; predates RCTs (Hall 2019, Dicken 2025)
- What does it say about Elawady's specific claim?
- Do the results apply to Germany and Europe?
High.
- What can explicitly not be concluded from this study?
That UPF are harmless.
Scientific in-depth review
1. Full reference
- Authors
- Gibney MJ et al.
- Journal
- Am J Clin Nutr
- Year
- 2017
- Identifier
- PMID 28793996 DOI 10.3945/ajcn.117.160440
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
Erratum: Am J Clin Nutr 2018;107(3):482-483; content not reviewed
- Extent checked
- abstract only
- Conflicts of interest and funding
Not stated in record
2. Research question
Critique of NOVA framework.
3. Study design and population
- Study design
- Narrative review – Critical commentary.
- Population
Not applicable
- Country
Ireland (authors)
- Period
2017
- Sample size
Not applicable
- Inclusion and exclusion criteria
Not applicable
4. Methods and endpoints
- Exposure / intervention
Not applicable
- Comparator
Not applicable
- Endpoints
Not applicable
- Statistical methods
Not applicable
5. Actual results
- Results
Argues no evidence that UPF are hyperpalatable/quasi-addictive; EU/US data do not show UPF-dominated diets are low in micronutrients; NOVA definition too broad for food-based dietary guidelines; little advantage over nutrient-based epidemiology.
- Absolute risks
not applicable
- Authors' conclusion
Little advantage of NOVA over current nutrient-based approach.
6. Strengths
- Articulates key criticisms
7. Weaknesses
- Opinion piece; predates RCTs (Hall 2019, Dicken 2025)
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
Commentary.
9. Assessment of the statistical interpretation
Not applicable.
10. Relevance to the specific claim
11. Independent contrary findings
Later trials (A-UPF-01, I-UPF-01) partly address its points.
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
Representative critique.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | indirect |
| Reproducibility | unknown |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Not applicable.
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
- Ultra-processed foods raise the risk of cardiovascular disease, type 2 diabetes, cancer and all-cause mortality; an umbrella review found 'convincing' evidence for cardiovascular mortality and type 2 diabetes. – Studies contradicting or limiting the claim