Meta-analysisindependent cross-checkabstract only checked I-LEG-04 standard review
Legumes and heart disease
Consumption of nuts and legumes and risk of incident ischemic heart disease, stroke, and diabetes: a systematic review and meta-analysis.
Overview
Afshin A et al.. Am J Clin Nutr 2014 · PMID 24898241 · DOI 10.3945/ajcn.113.076901
Eating legumes regularly was linked to 14% lower heart-disease risk.
Does the study support the specific claim? No · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Legumes and IHD
- How was the study done?
Meta-analysis
- How many people, animals or samples were studied?
~500,000
- What was actually found?
Lower IHD
- How large was the observed effect?
RR 0.86
- What do the results mean in everyday life?
Legumes compatible with heart health.
- What are the study's limitations?
Observational; overlap
- What does it say about Elawady's specific claim?
Contradicts harm
- Do the results apply to Germany and Europe?
Moderate
- What can explicitly not be concluded from this study?
Cannot prove causation.
Scientific in-depth review
1. Full reference
- Authors
- Afshin A et al.
- Journal
- Am J Clin Nutr
- Year
- 2014
- Identifier
- PMID 24898241 DOI 10.3945/ajcn.113.076901
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
NIH funding
2. Research question
Nut and legume intake vs IHD, stroke, diabetes.
3. Study design and population
- Study design
- Meta-analysis – Systematic review and meta-analysis (mainly prospective cohorts)
- Population
Adults
- Country
Multiple
- Period
Not stated
- Sample size
25 observational studies + 2 trial reports; 501,791 individuals
- Inclusion and exclusion criteria
Hard outcomes; adjusted estimates
4. Methods and endpoints
- Exposure / intervention
Legumes
- Comparator
Lower intake
- Endpoints
IHD, stroke, diabetes
- Statistical methods
Dose-response GLS
5. Actual results
- Results
Legumes: total IHD RR 0.86 (95% CI 0.78-0.94) per 4 weekly 100-g servings; not significantly associated with stroke or diabetes.
- Absolute risks
not reported
- Authors' conclusion
Supports inverse association between legumes and IHD.
6. Strengths
- Dose-response
7. Weaknesses
- Few legume studies (5 for IHD)
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
Observational.
9. Assessment of the statistical interpretation
Modest.
10. Relevance to the specific claim
Against general harm of legumes.
11. Independent contrary findings
None.
12. Transferability to Germany and Europe
Moderate.
13. Overall methodological judgement
Supports benefit; overlaps with I-LEG-01 cohorts.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | moderate |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Causality.
15. Linked fact checks
- Fava beans and lentils (together with flour products) are toxins that cause inflammation and deteriorate health; the fava bean hull is indigestible and the bean contains toxins that ferment 'dirtily'. – Studies contradicting or limiting the claim
- Because of favism (and the other narrow risks), legumes should be excluded from everyone's diet. – Studies contradicting or limiting the claim
- Legumes as a whole (fava beans, lentils, chickpeas, beans, cowpeas, peas, lupin, peanuts) are harmful and should be fully forbidden. – Studies contradicting or limiting the claim