Measurement / residue studyindependent cross-checkabstract checked I-EGG-121 standard review
Saudi market eggs: no lead, cadmium or arsenic detected
Evaluation of Heavy Metal Content in Feed, Litter, Meat, Meat Products, Liver, and Table Eggs of Chickens.
Overview
Korish MA, Attia YA. Animals (Basel) 2020 · PMID 32331361 · DOI 10.3390/ani10040727
Commercial table eggs had no detectable lead, cadmium or arsenic; chicken liver had the most metals.
Does the study support the specific claim? No · Methodological quality: low
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Measure metals in poultry products.
- How was the study done?
Market sampling and analysis.
- How many people, animals or samples were studied?
60 eggs, 45 meat items.
- What was actually found?
Toxic metals not detected in eggs.
- How large was the observed effect?
Not applicable.
- What do the results mean in everyday life?
Ordinary commercial eggs were not a source of toxic metals in this survey.
- What are the study's limitations?
Small sample.
- What does it say about Elawady's specific claim?
Contradicts general contamination of industrial eggs.
- Do the results apply to Germany and Europe?
Moderate.
- What can explicitly not be concluded from this study?
It cannot represent all producers or Egypt.
Scientific in-depth review
1. Full reference
- Authors
- Korish MA, Attia YA
- Journal
- Animals (Basel)
- Year
- 2020
- Identifier
- PMID 32331361 DOI 10.3390/ani10040727
- Verification
- verified – PubMed efetch 2026-10-26; Crossref works API 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
Deanship of Scientific Research, King Abdulaziz University; no conflicts declared.
2. Research question
What are the levels of trace elements and heavy metals in commercial poultry products in Saudi Arabia?
3. Study design and population
- Study design
- Measurement / residue study – Exposure measurement (market survey) of trace elements and heavy metals
- Population
Commercial chicken products and table eggs (4 brands) in Saudi Arabia
- Country
Saudi Arabia
- Period
not stated in abstract
- Sample size
60 table eggs; 45 broiler products; 30 feed/litter samples
- Inclusion and exclusion criteria
not detailed in abstract
4. Methods and endpoints
- Exposure / intervention
Commercial table eggs and poultry products
- Comparator
RDA and tolerable upper levels
- Endpoints
Fe, Cu, Zn, Mn, Se, Co, Cr, Pb, Cd, Ni (and As)
- Statistical methods
Descriptive comparisons
5. Actual results
- Results
Cd, Pb, As and Se were not detected in broiler meat or eggs; liver had the highest heavy-metal contents (Pb and Cd intake above recommended levels); burgers and frankfurters had higher Pb, Cd and Ni than eggs. Authors state chicken meat and table eggs are safe sources of nutrition.
- Absolute risks
not reported
- Authors' conclusion
Chicken meat and table eggs are safe; liver and meat products may present hazards.
6. Strengths
- Regional (Arab) commercial supply
- Several product types compared
7. Weaknesses
- Small sample; few brands
- Detection limits 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
- some concerns
- Rationale
Market survey; sampling not representative.
9. Assessment of the statistical interpretation
Descriptive only.
10. Relevance to the specific claim
Commercial (industrial) table eggs in an Arab market had no detectable Pb, Cd or As, contradicting the claim that industrial eggs are carriers of heavy metals. Also relevant to C-MEAT-02/03: liver accumulated the most metals.
11. Independent contrary findings
Hotspot studies (A-EGG-07, A-EGG-08) found higher levels near mines.
12. Transferability to Germany and Europe
Regional relevance for Egypt (Gulf commercial production).
13. Overall methodological judgement
Small but regionally relevant evidence against general heavy-metal contamination of commercial eggs.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | low |
| Risk of bias | some concerns |
| Precision of results | low |
| 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
Egyptian commercial egg monitoring data.
15. Linked fact checks
- Industrial (commercial, caged) egg production has turned the egg into a carrier of dioxins, PCBs, PFAS and heavy metals. – Studies contradicting or limiting the claim
- Meat today is 'injected' with something that directly damages the nerves (neuropathy); even bone-broth fat carries it; liver concentrates more toxins than meat, and milk even more. – Studies with mixed or unclear results