Cohort studyindependent cross-checkabstract checked I-VEG-142 standard review
Organic produce and breast cancer
Consumption of organic compared with conventional fruits and vegetables in relation to cancer risk: findings from the NutriNet-Santé cohort study.
Overview
Berlivet J et al.. Am J Clin Nutr 2026 · PMID 41862000 · DOI 10.1016/j.ajcnut.2026.101284
Replacing 100 g/day conventional with organic fruit and vegetables was linked to 10% lower postmenopausal breast cancer risk, not to lower overall cancer.
Does the study support the specific claim? Partly · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Assess organic vs conventional FV and cancer.
- How was the study done?
Cohort, substitution models.
- How many people, animals or samples were studied?
31,179 adults.
- What was actually found?
Possible breast-cancer benefit only.
- How large was the observed effect?
HR 0.90 (0.85-0.96).
- What do the results mean in everyday life?
Conventional produce is still beneficial; organic may add a small benefit.
- What are the study's limitations?
Confounding.
- What does it say about Elawady's specific claim?
Weak support for residue concern.
- Do the results apply to Germany and Europe?
European.
- What can explicitly not be concluded from this study?
Cannot prove causality.
Scientific in-depth review
1. Full reference
- Authors
- Berlivet J et al.
- Journal
- Am J Clin Nutr
- Year
- 2026
- Identifier
- PMID 41862000 DOI 10.1016/j.ajcnut.2026.101284
- Verification
- verified – PubMed efetch 2026-10-26; Crossref 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
COI statement: Conflict of interest The authors report no conflicts of interest.
2. Research question
Is substituting organic for conventional FV associated with cancer risk?
3. Study design and population
- Study design
- Cohort study – Prospective cohort (NutriNet-Santé) with substitution modelling of organic for conventional FV
- Population
French adults (75% women)
- Country
France
- Period
mean 7.3 years follow-up
- Sample size
31,179 (1,718 cancers)
- Inclusion and exclusion criteria
not stated in abstract
4. Methods and endpoints
- Exposure / intervention
Substitution of conventional with organic FV at fixed total FV intake
- Comparator
Conventional FV
- Endpoints
Overall and site-specific cancer
- Statistical methods
Cox models; marginal structural models
5. Actual results
- Results
Per 100 g/day substitution: overall cancer HR 0.98 (0.95-1.00); postmenopausal breast cancer HR 0.90 (0.85-0.96); no association for other sites; quintile analysis inverse only for postmenopausal breast cancer.
- Absolute risks
not reported
- Authors' conclusion
Substituting organic for conventional FV was associated with reduced postmenopausal breast cancer risk; needs investigation elsewhere.
6. Strengths
- Substitution design holding total FV constant
- Causal-inference sensitivity analyses
7. Weaknesses
- Volunteer cohort; organic consumers differ
- Multiple outcomes
8. Risk of bias
- Orienting tool
- ROBINS-E
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Residual confounding; multiplicity.
9. Assessment of the statistical interpretation
Overall cancer CI touches 1 (stats/C-VEG-13_pesticide_residue.py).
10. Relevance to the specific claim
Mixed: a possible benefit of organic over conventional for one cancer; does not suggest that FV themselves are harmful.
11. Independent contrary findings
Million Women Study (not added) found no overall benefit of organic food.
12. Transferability to Germany and Europe
French cohort.
13. Overall methodological judgement
Weak support for residue concerns; compatible with eating vegetables.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | indirect |
| Reproducibility | not replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Replication.
15. Linked fact checks
- Vegetables themselves are often harmful because of heavy pesticide use; organic diets show how much exposure conventional vegetables cause. – Studies with mixed or unclear results