Meta-analysiscited by the Tayebat archiveabstract only checked A-SUP-11 standard review
Fish oil and atrial fibrillation
Effect of Long-Term Marine ɷ-3 Fatty Acids Supplementation on the Risk of Atrial Fibrillation in Randomized Controlled Trials of Cardiovascular Outcomes: A Systematic Review and Meta-Analysis.
Overview
Gencer B et al.. Circulation 2021 · PMID 34612056 · DOI 10.1161/CIRCULATIONAHA.121.055654
Omega-3 pills raised AF risk by 25%, more at higher doses.
Does the study support the specific claim? Yes · Methodological quality: high
Plain-language summary
Study explained simply
- What did the researchers want to find out?
AF risk.
- How was the study done?
Meta-analysis.
- How many people, animals or samples were studied?
81,210.
- What was actually found?
More AF.
- How large was the observed effect?
HR 1.25.
- What do the results mean in everyday life?
Consider AF risk.
- What are the study's limitations?
Few trials.
- What does it say about Elawady's specific claim?
Supports.
- Do the results apply to Germany and Europe?
Applicable.
Scientific in-depth review
1. Full reference
- Authors
- Gencer B, Djousse L, Al-Ramady OT, Cook NR, Manson JE, Albert CM
- Journal
- Circulation
- Year
- 2021
- Identifier
- PMID 34612056 DOI 10.1161/CIRCULATIONAHA.121.055654 · PMC9109217
- Verification
- verified – PubMed E-utilities efetch, 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract; grants: NCCIH NIH HHS, NCI NIH HHS, NHLBI NIH HHS
2. Research question
Do marine omega-3 supplements increase atrial fibrillation?
3. Study design and population
- Study design
- Meta-analysis – Systematic review and meta-analysis of RCTs
- Population
Participants in CV outcome RCTs
- Country
Multinational
- Period
2012–2020
- Sample size
7 trials, 81,210
- Inclusion and exclusion criteria
see abstract
4. Methods and endpoints
- Exposure / intervention
Marine omega-3
- Comparator
Placebo/control
- Endpoints
Atrial fibrillation
- Statistical methods
Random effects, Knapp-Hartung, meta-regression
5. Actual results
- Results
AF HR 1.25 (1.07–1.46); >1 g/d HR 1.49 (1.04–2.15); ≤1 g/d HR 1.12 (1.03–1.22); per 1 g HR 1.11.
- Absolute risks
not reported in abstract
- Authors' conclusion
Omega-3 supplementation associated with increased AF risk, greater at >1 g/d.
6. Strengths
- RCT-based
- Dose-response
7. Weaknesses
- AF often not prespecified
- Few trials
8. Risk of bias
- Orienting tool
- AMSTAR 2
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- low
- Rationale
AMSTAR-2-oriented.
9. Assessment of the statistical interpretation
See results.
10. Relevance to the specific claim
11. Independent contrary findings
12. Transferability to Germany and Europe
High: biology and trial populations comparable to European adults.
13. Overall methodological judgement
Credible dose-related harm.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | high |
| Risk of bias | low |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | correctly reported |
14. Open questions
15. Linked fact checks
Use by the Tayebat archive
Note: according to the archive, the studies were compiled by the archive operators. Whether Dr. Elawady himself cited this study is not established.
- What the archive says about the study
Listed in the archive bibliography of the oral-supplements rule without its own interpretation; used implicitly to support the rule summary that supplements 'failed or caused harm' in large trials.
- A. What was actually studied?
Do marine omega-3 supplements increase atrial fibrillation?
- B. What did the authors find?
AF HR 1.25 (1.07–1.46); >1 g/d HR 1.49 (1.04–2.15); ≤1 g/d HR 1.12 (1.03–1.22); per 1 g HR 1.11.
- C. What conclusions do the authors themselves draw?
Omega-3 supplementation associated with increased AF risk, greater at >1 g/d.
- D. What does the archive derive from it?
Supports 'more atrial fibrillation'.
- E. Is this derivation scientifically justified?
Yes.
- Adequacy of the interpretation (by the archive)
- correctly reported