Guideline / position statementindependent cross-checkabstract only checked I-BAR-09 standard review
US guideline on nutrition after weight-loss surgery
Clinical Practice Guidelines for the Perioperative Nutrition, Metabolic, and Nonsurgical Support of Patients Undergoing Bariatric Procedures - 2019 Update (Executive Summary).
Overview
Mechanick JI et al.. Endocr Pract 2019 · PMID 31682518 · DOI 10.4158/GL-2019-0406
Nutrition and metabolic follow-up is a mandatory part of bariatric care.
Does the study support the specific claim? Partly · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Guideline
- How was the study done?
Expert guideline
- How many people, animals or samples were studied?
n/a
- What was actually found?
Nutritional care required
- How large was the observed effect?
n/a
- What do the results mean in everyday life?
Supplements and checks are standard
- What are the study's limitations?
Abstract only
- What does it say about Elawady's specific claim?
Supports need; not harm magnitude
- Do the results apply to Germany and Europe?
Similar in Europe
- What can explicitly not be concluded from this study?
Rates
Scientific in-depth review
1. Full reference
- Authors
- Mechanick JI et al.
- Journal
- Endocr Pract
- Year
- 2019
- Identifier
- PMID 31682518 DOI 10.4158/GL-2019-0406
- Verification
- verified – PubMed efetch 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract
2. Research question
Perioperative nutrition and metabolic care
3. Study design and population
- Study design
- Guideline / position statement – Multisociety clinical practice guideline (AACE/TOS/ASMBS/OMA/ASA)
- Sample size
85 numbered recommendations; 858 citations
4. Methods and endpoints
5. Actual results
- Results
31 Grade A, 42 Grade B, 72 Grade C, 101 Grade D recommendations. States bariatric procedures remain safe and effective for higher-risk patients; mandatory team approach with special attention to nutritional and metabolic issues.
- Absolute risks
not reported
- Authors' conclusion
Bariatric procedures remain a safe and effective intervention; attention to nutritional issues required.
6. Strengths
- Multisociety
7. Weaknesses
- Many low-grade recommendations
- Detailed supplement doses not in abstract
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
Confirms that nutritional monitoring is a standard part of care (C-BAR-05).
11. Independent contrary findings
12. Transferability to Germany and Europe
US guideline; European guidelines similar (not verified here).
13. Overall methodological judgement
Supports need for lifelong nutritional care.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | direct |
| 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
- Bariatric surgery causes lifelong deficiencies of iron, B12, vitamin D, calcium and protein, requiring lifelong supplements. – Studies supporting the claim