Guideline / position statementindependent cross-checkabstract checked I-BAR-122 standard review
American guideline on vitamins after weight-loss surgery
American Society for Metabolic and Bariatric Surgery Integrated Health Nutritional Guidelines for the Surgical Weight Loss Patient 2016 Update: Micronutrients.
Overview
Parrott et al.. Surg Obes Relat Dis 2017 · PMID 28392254 · DOI 10.1016/j.soard.2016.12.018
Experts recommend screening before surgery and preventive vitamin and mineral supplements afterwards.
Does the study support the specific claim? Yes · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Micronutrient care
- How was the study done?
Guideline
- How many people, animals or samples were studied?
not applicable
- What was actually found?
92 recommendations
- How large was the observed effect?
not applicable
- What do the results mean in everyday life?
Take supplements and get checked
- What are the study's limitations?
Dated
- What does it say about Elawady's specific claim?
Supports supplement requirement
- Do the results apply to Germany and Europe?
Similar in Europe
- What can explicitly not be concluded from this study?
Individual needs
Scientific in-depth review
1. Full reference
- Authors
- Parrott et al.
- Journal
- Surg Obes Relat Dis
- Year
- 2017
- Identifier
- PMID 28392254 DOI 10.1016/j.soard.2016.12.018
- Verification
- verified – PubMed efetch 2026-10-26 + Crossref API
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract
2. Research question
How should micronutrients be screened, supplemented and repleted before and after weight-loss surgery?
3. Study design and population
- Study design
- Guideline / position statement – Society clinical practice guideline (ASMBS Integrated Health, 2016 update, micronutrients)
- Population
Patients undergoing LAGB, RYGB, LSG, BPD, BPD/DS
- Country
USA
- Period
2016 update (published 2017)
- Sample size
554 articles identified, 402 reviewed in detail
- Inclusion and exclusion criteria
Literature on 11 micronutrients
4. Methods and endpoints
- Exposure / intervention
Weight-loss surgery
- Comparator
not applicable
- Endpoints
92 graded recommendations
- Statistical methods
Evidence grades A-D
5. Actual results
- Results
92 recommendations (79 new) on B1, B12, folate, iron, A, E, K, calcium, D, copper, zinc. States deficiencies are common before surgery and that the prevalence of deficiencies is increasing while follow-up monitoring is decreasing.
- Absolute risks
not applicable
- Authors' conclusion
Guideline for preoperative and postoperative screening and preventive supplementation.
6. Strengths
- Procedure-specific micronutrient guidance
7. Weaknesses
- Dated (2016); US perspective
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
- Rationale
Guideline.
9. Assessment of the statistical interpretation
not applicable
10. Relevance to the specific claim
Confirms that preventive lifelong supplementation and monitoring are standard care (supports the substance of C-BAR-05).
11. Independent contrary findings
Shows deficiencies are preventable with supplementation.
12. Transferability to Germany and Europe
US guideline; similar to European practice.
13. Overall methodological judgement
Authoritative guideline.
| 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
None.
15. Linked fact checks
- Bariatric surgery causes lifelong deficiencies of iron, B12, vitamin D, calcium and protein, requiring lifelong supplements. – Studies supporting the claim