Meta-analysisindependent cross-checkabstract only checked I-EGG-08 standard review
Eggs and type 2 diabetes: updated analysis
Egg consumption and risk of type 2 diabetes: findings from 3 large US cohort studies of men and women and a systematic review and meta-analysis of prospective cohort studies.
Overview
Drouin-Chartier JP et al.. Am J Clin Nutr 2020 · PMID 32453379 · DOI 10.1093/ajcn/nqaa115
No overall link; higher risk only in US studies.
Does the study support the specific claim? No · Methodological quality: high
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Egg intake and T2D risk
- How was the study done?
Three US cohorts plus meta-analysis of 16 cohorts
- How many people, animals or samples were studied?
213,798 cohort participants (20,514 cases); meta-analysis 589,559 participants, 41,248 cases; US cohorts; global cohorts
- What was actually found?
Cohorts: +1 egg/day HR +14% (7%-20%). Meta-analysis RR 1.07 (0.99-1.15), I2 69.8%; US 1.18 (1.10-1.27); Europe 0.99 (0.85-1.15); Asia 0.82 (0.62-1.09).
- How large was the observed effect?
Cox; random effects
- What do the results mean in everyday life?
Outside the US eggs were not linked to diabetes.
- What are the study's limitations?
Heterogeneity
- What does it say about Elawady's specific claim?
Contradicts general claim.
- Do the results apply to Germany and Europe?
European studies null.
- What can explicitly not be concluded from this study?
Cannot explain US finding.
Scientific in-depth review
1. Full reference
- Authors
- Drouin-Chartier JP et al.
- Journal
- Am J Clin Nutr
- Year
- 2020
- Identifier
- PMID 32453379 DOI 10.1093/ajcn/nqaa115
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
None stated in record
2. Research question
Egg intake and T2D risk
3. Study design and population
- Study design
- Meta-analysis – Three US cohorts plus meta-analysis of 16 cohorts
- Population
US cohorts; global cohorts
- Country
USA; multinational
- Period
1980-2017
- Sample size
213,798 cohort participants (20,514 cases); meta-analysis 589,559 participants, 41,248 cases
- Inclusion and exclusion criteria
Free of T2D, CVD, cancer
4. Methods and endpoints
- Exposure / intervention
Egg intake
- Comparator
per 1 egg/day
- Endpoints
Incident T2D
- Statistical methods
Cox; random effects
5. Actual results
- Results
Cohorts: +1 egg/day HR +14% (7%-20%). Meta-analysis RR 1.07 (0.99-1.15), I2 69.8%; US 1.18 (1.10-1.27); Europe 0.99 (0.85-1.15); Asia 0.82 (0.62-1.09).
- Absolute risks
not reported
- Authors' conclusion
No overall association between moderate egg consumption and T2D; regional heterogeneity.
6. Strengths
- Updated, registered
7. Weaknesses
- Heterogeneity
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Simplified.
9. Assessment of the statistical interpretation
Overall null; US positive.
10. Relevance to the specific claim
11. Independent contrary findings
US positive association.
12. Transferability to Germany and Europe
European studies null.
13. Overall methodological judgement
No overall association.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | high |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
US differences.
15. Linked fact checks
- Higher egg intake is linked to type 2 diabetes. – Studies contradicting or limiting the claim