Measurement / residue studyindependent cross-checkabstract checked I-LEG-119 standard review

Does cooking destroy bean lectins?

Toxicity Assessment of Common Beans (Phaseolus vulgaris L.) Widely Consumed by Tunisian Population.

Overview

Nciri N et al.. J Med Food 2015 · PMID 26355953 · DOI 10.1089/jmf.2014.0120

Raw white beans contained much lectin, but soaking followed by cooking removed its activity.

Does the study support the specific claim? No · Methodological quality: moderate

Study explained simply

What did the researchers want to find out?: Measure lectin after processing.
How was the study done?: Lab assays.
How many people, animals or samples were studied?: Tunisian bean varieties.
What was actually found?: Cooking removed activity.
How large was the observed effect?: Qualitative.
What do the results mean in everyday life?: Properly cooked beans do not carry active lectin.
What are the study's limitations?: No human data.
What does it say about Elawady's specific claim?: Contradicts C-LEG-07.
Do the results apply to Germany and Europe?: Applicable.
What can explicitly not be concluded from this study?: It cannot set a safe cooking time for every bean.

Authors: Nciri N et al.
Journal: J Med Food
Year: 2015
Identifier: PMID 26355953 DOI 10.1089/jmf.2014.0120
Verification: verified – PubMed efetch 2026-10-26 + Crossref works API
Retracted: no
Corrections: none
Extent checked: abstract only
Conflicts of interest and funding: Non-US government support (PubMed publication type).

How do soaking, cooking, autoclaving and germination affect PHA in white beans consumed in Tunisia?

Study design: Measurement / residue study – Laboratory study of phytohaemagglutinin content and activity after processing
Population: Three Tunisian white bean varieties; imported and local canned beans
Country: Tunisia
Period: Not stated
Sample size: Bean samples (not a human study)
Inclusion and exclusion criteria: Not applicable

Results: Raw dry beans contained considerable PHA; soaking alone increased measured PHA; cooking or autoclaving of presoaked beans led to complete disappearance of PHA by ELISA and loss of haemagglutinating activity; autoclaved unsoaked beans also lost activity; canned beans contained immunoreactive 'fingerprints' of PHA.
Absolute risks: Not applicable
Authors' conclusion: Combining soaking and cooking/autoclaving is the best way to reduce PHA content and activity.

Not applicable.

Shows that proper cooking abolishes lectin activity (contradicts C-LEG-07; consistent with C-LEG-06).

I-LEG-121 (raw-bean lectin effects in cells/rats).

Applicable.

Supports the view that lectin risk is a preparation issue.

Multidimensional assessment
Multidimensional assessment
Authenticity of the source	verified
Methodological quality	moderate
Risk of bias	some concerns
Precision of results	not applicable
Directness	indirect
Reproducibility	replicated
Consistency with the overall evidence	consistent
Regional transferability	high
Adequacy of the interpretation (by the archive)	not applicable

Residual activity after short or low-temperature cooking.