Othercited by the Tayebat archiveabstract only checked A-ORG-07 standard review
Editorial: gallbladder removal and fatty liver
Cholecystectomy and NAFLD: does gallbladder removal have metabolic consequences?
Overview
Nervi F et al.. Am J Gastroenterol 2013 · PMID 23735917 · DOI 10.1038/ajg.2013.84
A US survey found fatty liver more often in people without a gallbladder; cause unclear.
Does the study support the specific claim? Unclear · Methodological quality: very low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Hypothesis
- How was the study done?
Editorial
- How many people, animals or samples were studied?
n/a
- What was actually found?
Association
- How large was the observed effect?
OR 2.4
- What do the results mean in everyday life?
Possible link
- What are the study's limitations?
Cross-sectional
- What does it say about Elawady's specific claim?
Weak
- Do the results apply to Germany and Europe?
Uncertain
- What can explicitly not be concluded from this study?
Causation
Scientific in-depth review
1. Full reference
- Authors
- Nervi F, Arrese M
- Journal
- Am J Gastroenterol
- Year
- 2013
- Identifier
- PMID 23735917 DOI 10.1038/ajg.2013.84
- Verification
- verified – PubMed E-utilities efetch, 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
COI: not stated in record | Grants: none listed
2. Research question
Does cholecystectomy have metabolic consequences (NAFLD)?
3. Study design and population
- Study design
- Other – Editorial commentary on a NHANES III cross-sectional analysis
- Country
USA (data source)
- Sample size
n/a (comments on NHANES 1988-1994)
4. Methods and endpoints
5. Actual results
- Results
Reports that Ruhl & Everhart found NAFLD associated with cholecystectomy (OR 2.4; 1.8-3.3) but not with gallstones (OR 1.1; 0.84-1.4).
- Absolute risks
not reported
- Authors' conclusion
Cholecystectomy may not be innocuous and may contribute to NAFLD.
6. Strengths
- Raises hypothesis
7. Weaknesses
- Editorial; cross-sectional underlying data; reverse causation possible
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- not assessable
9. Assessment of the statistical interpretation
10. Relevance to the specific claim
Weak support for metabolic role.
11. Independent contrary findings
12. Transferability to Germany and Europe
Uncertain.
13. Overall methodological judgement
Opinion piece; low weight.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | very low |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | indirect |
| Reproducibility | unknown |
| Consistency with the overall evidence | consistent |
| Regional transferability | moderate |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- Cholecystectomy causes a persistent long-term excess of proximal small-bowel adenocarcinoma and right-sided colon cancer (Lagergren 2001). – Studies with mixed or unclear results
- Long-term registry data link removal of tonsils, appendix, gallbladder, uterus, ovaries and spleen to higher rates of respiratory disease, autoimmunity, cardiovascular events, gastrointestinal cancers and dementia; each organ does work the body never fully replaces. – Studies with mixed or unclear results
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 only; the archive gives no specific interpretation.
- A. What was actually studied?
Editorial on NAFLD and cholecystectomy
- B. What did the authors find?
Cross-sectional association
- C. What conclusions do the authors themselves draw?
Hypothesis
- D. What does the archive derive from it?
Supports 'gallbladder is a metabolic station'.
- E. Is this derivation scientifically justified?
Only hypothesis-generating.
- Adequacy of the interpretation (by the archive)
- not applicable