Narrative reviewcited by the Tayebat archiveabstract only checked A-LEG-06 standard review
Minerals from legumes
Bioavailability of minerals in legumes.
Overview
Sandberg AS. Br J Nutr 2002 · PMID 12498628 · DOI 10.1079/BJN/2002718
Phytate reduces iron and zinc absorption, but processing reduces phytate and balanced diets are not at risk.
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?
Review legume minerals
- How was the study done?
Narrative review
- How many people, animals or samples were studied?
Not applicable
- What was actually found?
Phytate inhibits; soaking/fermenting helps
- How large was the observed effect?
Not applicable
- What do the results mean in everyday life?
Soak, sprout or ferment legumes.
- What are the study's limitations?
Narrative
- What does it say about Elawady's specific claim?
Limits the archive's claim
- Do the results apply to Germany and Europe?
High
- What can explicitly not be concluded from this study?
Cannot support a legume ban.
Scientific in-depth review
1. Full reference
- Authors
- Sandberg AS
- Journal
- Br J Nutr
- Year
- 2002
- Identifier
- PMID 12498628 DOI 10.1079/BJN/2002718
- 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
2. Research question
Mineral bioavailability from legumes and processing effects.
3. Study design and population
- Study design
- Narrative review – Narrative review
- Population
Not applicable
- Country
Not applicable
- Period
Not applicable
- Sample size
Not applicable
- Inclusion and exclusion criteria
Not reported
4. Methods and endpoints
- Exposure / intervention
Phytate, polyphenols, soya protein; processing
- Comparator
Not applicable
- Endpoints
Fe and Zn absorption
- Statistical methods
Not applicable
5. Actual results
- Results
Phytate main inhibitor of Fe and Zn absorption; soaking, germination, hydrothermal treatment, fermentation and enzymes degrade phytate; 'in a balanced diet containing animal protein a high intake of legumes is not considered a risk in terms of mineral supply'.
- Absolute risks
not reported
- Authors' conclusion
Once phytate is degraded, legumes would become good sources of Fe and Zn.
6. Strengths
- Clear processing guidance
7. Weaknesses
- Narrative
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
Narrative review.
9. Assessment of the statistical interpretation
Not applicable.
10. Relevance to the specific claim
Supports mechanism in C-LEG-08 and contradicts C-LEG-04.
11. Independent contrary findings
Its own conclusion.
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
The source limits the archive's argument.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | not assessable |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | high |
| Adequacy of the interpretation (by the archive) | partly correct but over-interpreted |
14. Open questions
None major.
15. Linked fact checks
- Because of favism (and the other narrow risks), legumes should be excluded from everyone's diet. – Studies contradicting or limiting the claim
- Phytic acid in legumes inhibits iron and zinc absorption; iron bioavailability is 5-12% from vegetarian diets versus 14-18% from mixed diets. – 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
Bibliography only (supporting phytate argument).
- A. What was actually studied?
Legume mineral bioavailability.
- B. What did the authors find?
Phytate inhibits; processing degrades it; balanced diets not at risk.
- C. What conclusions do the authors themselves draw?
Legumes can be good Fe/Zn sources after phytate degradation.
- D. What does the archive derive from it?
Implied support for avoiding legumes.
- E. Is this derivation scientifically justified?
Not justified: the review's conclusion argues against avoidance in balanced diets.
- Adequacy of the interpretation (by the archive)
- partly correct but over-interpreted