Measurement / residue studyindependent cross-checkabstract checked★ key study I-RES-103 in-depth review
Pesticides often found in Egyptian onions, but at very low exposure
Temporal Trends, Multiple Residue Incidence, and Chronic Health Risk of Pesticides in Egyptian Onions: A Four-Year Market Surveillance.
Overview
Malhat F et al.. J Xenobiot 2025 · PMID 41283430 · DOI 10.3390/jox15060192
Up to half of onion samples had residues and up to 8% exceeded EU limits, but intake stayed below 2.3% of safe levels.
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?
How common are pesticide residues in Egyptian onions and what is the chronic consumer risk?
- How was the study done?
Four-year market surveillance with multi-residue analysis and EFSA PRIMo risk assessment
- How many people, animals or samples were studied?
5,731 samples; 430 pesticides
- What was actually found?
Residue-free samples 51.19% (2023) to 75.59% (2022); EU MRL exceedances 1.34% (2022) to 8.33% (2023); multiple residues 9.76-30.82%. Exceedances incl. imazalil, chlorpropham, chlorpyrifos, imidacloprid, profenofos. Chronic exposure for all population groups well below ADIs; maximum 2.27% of ADI (chlorpyrifos, high-consumption regions).
- How large was the observed effect?
Residue-free samples 51.19% (2023) to 75.59% (2022); EU MRL exceedances 1.34% (2022) to 8.33% (2023); multiple residues 9.76-30.82%. Exceedances incl. imazalil, chlorpropham, chlorpyrifos, imidacloprid, profenofos. Chronic exposure for all population groups well below ADIs; maximum 2.27% of ADI (chlorpyrifos, high-consumption regions).
- What do the results mean in everyday life?
Residues are common but the amounts eaten are far below safe limits.
- What are the study's limitations?
One commodity; Sampling frame not described in abstract
- What does it say about Elawady's specific claim?
Detection supports 'residues are present'; exposure contradicts 'toxins causing disease'.
- Do the results apply to Germany and Europe?
Egyptian domestic market; EU border data differ.
- What can explicitly not be concluded from this study?
Covers one food; cumulative effects not assessed.
Scientific in-depth review
1. Full reference
- Authors
- Malhat F et al.
- Journal
- J Xenobiot
- Year
- 2025
- Identifier
- PMID 41283430 DOI 10.3390/jox15060192
- Verification
- verified – PubMed efetch 2026-10-26; Crossref 2026-10-26
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract
2. Research question
How common are pesticide residues in Egyptian onions and what is the chronic consumer risk?
3. Study design and population
- Study design
- Measurement / residue study – Four-year market surveillance with multi-residue analysis and EFSA PRIMo risk assessment
- Population
Onion samples from Egyptian markets
- Country
Egypt
- Period
2021-2024
- Sample size
5,731 samples; 430 pesticides
- Inclusion and exclusion criteria
as described in the abstract
4. Methods and endpoints
- Exposure / intervention
Pesticide residues
- Comparator
EU MRLs; ADIs
- Endpoints
Residue-free share, MRL exceedances, %ADI
- Statistical methods
as reported in the abstract
5. Actual results
- Results
Residue-free samples 51.19% (2023) to 75.59% (2022); EU MRL exceedances 1.34% (2022) to 8.33% (2023); multiple residues 9.76-30.82%. Exceedances incl. imazalil, chlorpropham, chlorpyrifos, imidacloprid, profenofos. Chronic exposure for all population groups well below ADIs; maximum 2.27% of ADI (chlorpyrifos, high-consumption regions).
- Absolute risks
not reported
- Authors' conclusion
Despite violations, chronic exposure remained well below ADI thresholds.
6. Strengths
- Very large sample
- Four years
- Standard EFSA model
7. Weaknesses
- One commodity
- Sampling frame not described 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
- low
- Rationale
Large surveillance dataset.
9. Assessment of the statistical interpretation
Detection common; exposure a small fraction of ADI.
10. Relevance to the specific claim
Large Egyptian dataset separating detection from exposure.
11. Independent contrary findings
12. Transferability to Germany and Europe
13. Overall methodological judgement
Up to half of onion samples had residues and up to 8% exceeded EU limits, but intake stayed below 2.3% of safe levels.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | low |
| Precision of results | high |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | low |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- Everyday foods carry 'explicit toxins': residues of antibiotics, fertilisers, stimulants/growth promoters, chemicals and pesticide residues, which the body must deal with daily. – Studies with mixed or unclear results
- Pesticide, antibiotic and hormone residues in food are a main cause of chronic health problems (implied by his theory statement and recurring remarks such as 'you are poisoned: the amount of pesticides and hormones'). – Studies contradicting or limiting the claim
- In Egypt, vegetables carry pesticide residues, including internationally banned pesticides, at levels that can be harmful. – Studies with mixed or unclear results