Meta-analysisindependent cross-checkabstract only checked I-WHT-02 standard review
Refined grains and heart disease (industry-linked author)
Refined grain intake and cardiovascular disease: Meta-analyses of prospective cohort studies.
Overview
Gaesser GA. Trends Cardiovasc Med 2024 · PMID 36075506 · DOI 10.1016/j.tcm.2022.08.002
Pooled cohorts showed no clear link between refined grains and heart disease.
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?
Refined grains and CVD
- How was the study done?
Meta-analysis
- How many people, animals or samples were studied?
17 cohorts
- What was actually found?
No association
- How large was the observed effect?
HR 1.08 (ns)
- What do the results mean in everyday life?
Moderate refined grains not clearly harmful
- What are the study's limitations?
COI, heterogeneity
- What does it say about Elawady's specific claim?
Limits harm claim
- Do the results apply to Germany and Europe?
Moderate
- What can explicitly not be concluded from this study?
Benefit of refined grains
Scientific in-depth review
1. Full reference
- Authors
- Gaesser GA
- Journal
- Trends Cardiovasc Med
- Year
- 2024
- Identifier
- PMID 36075506 DOI 10.1016/j.tcm.2022.08.002
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
Not stated in the PubMed record. The same author disclosed grant support from the Wheat Foods Council and Grain Foods Foundation and advisory board roles (Grain Foods Foundation, Wheat Foods Council, Ardent Mills) in a 2019 review (PMID 30947337, PMC full text read).
2. Research question
Refined grains (as a distinct category) and CVD
3. Study design and population
- Study design
- Meta-analysis – Meta-analysis of prospective cohorts
- Population
Cohort participants
- Country
Multiple
- Period
Search to 30 June 2022
- Sample size
17 cohorts, >875,000 participants
- Inclusion and exclusion criteria
Refined grains as distinct category only
4. Methods and endpoints
- Exposure / intervention
Refined grains; white rice
- Comparator
Lowest
- Endpoints
CVD, stroke, heart failure
- Statistical methods
RevMan random effects
5. Actual results
- Results
Refined grains: CVD HR 1.08 (0.99-1.18; I2 70%; 9 cohorts); stroke 1.06 (0.92-1.23); heart failure 0.95 (0.77-1.16). White rice: CVD 0.93 (0.86-1.00); stroke 1.03 (0.93-1.14). No publication bias evident.
- Absolute risks
not reported
- Authors' conclusion
Refined grains not associated with CVD; consider in future guidelines.
6. Strengths
- Restricts to refined grains as separate category
7. Weaknesses
- Single author
- Likely industry links
- High heterogeneity
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- high
- Rationale
Single-author review; COI concern.
9. Assessment of the statistical interpretation
Null CIs include modest increases.
10. Relevance to the specific claim
Counter-evidence for C-WHT-03, but with COI concern.
11. Independent contrary findings
12. Transferability to Germany and Europe
Moderate.
13. Overall methodological judgement
Useful but should be weighted cautiously.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | high |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | mixed |
| Regional transferability | moderate |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
Full COI for this paper.
15. Linked fact checks
- Heavy intake of refined grains (white bread etc.) is associated in the largest population studies with higher mortality and major cardiovascular disease (archive: PURE, +27% mortality, +33% major cardiovascular events at >=350 g/day). – Studies contradicting or limiting the claim
- Replacing refined grains with whole grains lowers all-cause mortality by 17% and coronary heart disease by 19%, while refined grains offer no protective benefit (archive interpretation of Aune 2016). – Studies with mixed or unclear results
- Rice in all forms (including white rice) is allowed without restriction; 'rice is sugar' and two spoons of rice a day sustain life. – Studies supporting the claim