Narrative reviewcited by the Tayebat archiveabstract only checked A-BAR-21 standard review
Review: deficiencies after surgery
Nutritional deficiencies after bariatric surgery.
Overview
Bal BS et al.. Nat Rev Endocrinol 2012 · PMID 22525731 · DOI 10.1038/nrendo.2012.48
Protein, vitamins and minerals can become deficient; many patients were already deficient before surgery.
Does the study support the specific claim? Yes · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Review
- How was the study done?
Narrative
- How many people, animals or samples were studied?
n/a
- What was actually found?
Deficiencies common
- How large was the observed effect?
n/a
- What do the results mean in everyday life?
Follow-up needed
- What are the study's limitations?
Old, narrative
- What does it say about Elawady's specific claim?
Supports
- Do the results apply to Germany and Europe?
Applicable
- What can explicitly not be concluded from this study?
Rates
Scientific in-depth review
1. Full reference
- Authors
- Bal BS, Finelli FC, Shope TR, Koch TR
- Journal
- Nat Rev Endocrinol
- Year
- 2012
- Identifier
- PMID 22525731 DOI 10.1038/nrendo.2012.48
- 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
Nutrient deficiencies after bariatric surgery
3. Study design and population
- Study design
- Narrative review – Narrative review
- Population
Bariatric patients
- Sample size
n/a
4. Methods and endpoints
5. Actual results
- Results
Protein malnutrition is the major macronutrient deficiency; micronutrient deficiencies common before surgery and often persist despite supplements; vitamin D deficiency and metabolic bone disease may explain increased hip fracture after RYGB.
- Absolute risks
not reported
- Authors' conclusion
Further studies needed on optimal supplementation; clinicians should treat symptoms suggesting deficiencies.
6. Strengths
- Comprehensive
7. Weaknesses
- Non-systematic
- 2012
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
Supports C-BAR-05.
11. Independent contrary findings
12. Transferability to Germany and Europe
Applicable.
13. Overall methodological judgement
Supportive.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | replicated |
| 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
- Bariatric surgery causes lifelong deficiencies of iron, B12, vitamin D, calcium and protein, requiring lifelong supplements. – Studies supporting the claim
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?
Deficiencies
- B. What did the authors find?
Common, persist despite supplementation
- C. What conclusions do the authors themselves draw?
Monitoring
- D. What does the archive derive from it?
Supports deficiency narrative.
- E. Is this derivation scientifically justified?
Supported.
- Adequacy of the interpretation (by the archive)
- not applicable