Narrative reviewindependent cross-checkabstract only checked★ key study I-LEG-08 in-depth review
G6PD deficiency review (Blood 2020)
Glucose-6-phosphate dehydrogenase deficiency.
Overview
Luzzatto L et al.. Blood 2020 · PMID 32702756 · DOI 10.1182/blood.2019000944
About 500 million people carry G6PD deficiency; fava beans, some drugs and infections trigger haemolysis.
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 G6PD
- How was the study done?
Narrative review
- How many people, animals or samples were studied?
Not applicable
- What was actually found?
Fava ingestion trigger
- How large was the observed effect?
Not applicable
- What do the results mean in everyday life?
Targeted fava avoidance.
- What are the study's limitations?
Narrative
- What does it say about Elawady's specific claim?
Supports favism; names fava specifically
- Do the results apply to Germany and Europe?
High
- What can explicitly not be concluded from this study?
Cannot support avoidance for non-deficient people.
Scientific in-depth review
1. Full reference
- Authors
- Luzzatto L et al.
- Journal
- Blood
- Year
- 2020
- Identifier
- PMID 32702756 DOI 10.1182/blood.2019000944
- 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
Genetics, epidemiology and clinical aspects of G6PD deficiency.
3. Study design and population
- Study design
- Narrative review – Narrative review
- Population
Global
- Country
Global
- Period
Not applicable
- Sample size
Not applicable
- Inclusion and exclusion criteria
Not applicable
4. Methods and endpoints
- Exposure / intervention
G6PD mutations; triggers
- Comparator
Not applicable
- Endpoints
Haemolysis
- Statistical methods
Not applicable
5. Actual results
- Results
Over 200 mutations; ~500 million people affected, mostly asymptomatic; acute haemolytic anaemia triggered by ingestion of fava beans, certain drugs (e.g. primaquine, rasburicase) or more rarely infection; distribution correlates with malaria.
- Absolute risks
not reported
- Authors' conclusion
Acute haemolytic anaemia can be managed effectively if promptly diagnosed.
6. Strengths
- Authoritative, recent
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
Defines fava (not legumes in general) as dietary trigger.
11. Independent contrary findings
None.
12. Transferability to Germany and Europe
High.
13. Overall methodological judgement
Key reference.
| 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) | not applicable |
14. Open questions
None.
15. Linked fact checks
- Fava bean ingestion triggers acute haemolytic anaemia (favism) in people with G6PD deficiency, which is the most common human enzyme defect and is frequent around the Mediterranean, the Middle East and Egypt. – Studies supporting the claim
- In G6PD deficiency, haemolysis is triggered by merely smelling fava beans and by eating lentils, as well as by aspirin and antibiotics. – Studies contradicting or limiting the claim