Nezam El-Tayebat Fact CheckA scientific assessment of the “نظام الطيبات” nutrition system
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Mostly true True only under certain conditions Certainty of evidence: moderate provisional C-CHK-03

Because of intensive production, modern chicken breast has become 'like wood' (woody breast).

In short: This observation is largely correct: fast-growing broilers frequently develop 'woody breast' (severe in about 1 of 8 fillets in a large survey), mainly because of rapid growth; it is a meat-quality and welfare problem, not shown to harm consumers.
Conclusion: 'Woody breast' is real in fast-growing broilers; it is a quality and welfare issue.
  1. Original statement
  2. Scientific assessment
  3. Scientific evidence in detail
  4. In plain language
  5. Studies on this claim
  6. Regional context
  7. What applies in my country?
  8. References

Original statement

صدر الدجاج الحديث بسبب طرق الإنتاج المكثفة والمضادات الحيوية تحوّل إلى ما يشبه الخشب

verbatim according to source. Translation by the project; the Arabic wording is authoritative.

Translation

Because of intensive production, modern chicken breast has become 'like wood' (woody breast).

Origin

Source status
Archive quote (no location given)
Attribution
Elawady (archive paraphrase; source video not given)
Origin
https://eltayebat.com/rule/industrial-chicken/
Attribution uncertainty
The archive attributes this text to Dr. Diaa in its 'د. ضياء يقول' box but gives no video reference. Transcript check (the project's research files, keyword search of 307 archive transcripts): found_close_paraphrase. 'Woody' and indigestible chicken breast (sBo_ARs-eQU, 4SCQUSBW4xU) and antibiotic-driven rapid growth (kUxN08QKy9k) are found, but the explicit causal chain 'because of intensive production and antibiotics the breast turned to wood' was not found in a single passage.
Claimed mechanism

Intensive production and antibiotics.

Claimed health effect

(see C-CHK-04)

Population concerned

general population (not specified)

Geographic restriction by Elawady

none found

Diverging source versions

Source status
Video transcript (own words)
Attribution
Elawady (machine transcript)
Video
بودكاست قبل رمضان (Open source)
Published
17 February 2026
Timestamp
not available (transcript has no timings)
Attribution uncertainty
Archive transcript (YouTube CC or AI-generated); wording may contain transcription errors; no timestamps available.

صدر الفرخه اتعمل عليه دراسات في امريكا قال لك الودن التشيكن بريست يعني يعني صدر الفرخه الخشبي فما بيتبلعش

Studies were done in America on the chicken breast; they call it 'wooden chicken breast', i.e. the woody chicken breast, so it cannot be swallowed.

Source status
Video transcript (own words)
Attribution
Elawady (machine transcript)
Video
Dr Diaa Al Awady د ضياء العوضي is live! البلازما و تكوين البول - النسيج الكلوي (Open source)
Published
15 August 2025
Timestamp
0:31:15 (location in the original video’s automatic YouTube caption track; confirms where the words occur, not who speaks)
Attribution uncertainty
Archive transcript (YouTube CC or AI-generated); no timestamps; wording may contain speech-recognition errors; speaker turns are not marked, the excerpt was judged to be Elawady's own speech from context.

او ان صدر الفرخه ممكن يبقى ودن او متخشب وما بيتهضمش

...or that the chicken breast can be 'wooden' or hardened and is not digested.

Source status
Video transcript (own words)
Attribution
Elawady (machine transcript)
Video
Dr Diaa Al Awady د ضياء العوضي is live!صباح الخير اتباع العوضي (Open source)
Published
19 September 2025
Timestamp
1:30:59 (location in the original video’s automatic YouTube caption track; confirms where the words occur, not who speaks)
Attribution uncertainty
Archive transcript (YouTube CC or AI-generated); no timestamps; YouTube original not checked; wording may contain recognition errors. Close paraphrase (woody and indigestible).

وبعدين كبر لك الفراخ بالمضادات الحيويه فهو عارف يكبر فرخه من 10 جرام كتكوت خلاها فرخه 3 كيلو في 40 يوم

...and then he grew the chickens for you with antibiotics; he knows how to grow a 10-gram chick into a 3-kilo chicken in 40 days.

Source status
Video transcript (own words)
Attribution
Elawady (machine transcript)
Video
Dr Diaa Al Awady د ضياء العوضي is live!لايف بصراحة (Open source)
Published
27 January 2026
Timestamp
0:59:35 (location in the original video’s automatic YouTube caption track; confirms where the words occur, not who speaks)
Attribution uncertainty
Archive transcript (YouTube CC or AI-generated); no timestamps; YouTube original not checked; wording may contain recognition errors. Related part (antibiotic-driven growth); not linked to woody breast in this passage.

Scientific assessment

Mostly true – Correct at its core, but with limitations or minor inaccuracies.

Certainty of evidence: moderate – Further research may still affect the assessment.

1. What was claimed?

Modern chicken breast has become wood-like due to intensive production and antibiotics.

2. What is demonstrably correct?

'Woody breast' is a recognised myopathy of fast-growing broilers (I-CHK-11). In a representative Canadian survey of 9,250 fillets, 11.8% had severe woody breast and 96% white striping; risk rose with bird weight (I-CHK-108).

3. What is wrong or exaggerated?

The evidence points to rapid growth, not antibiotics, as the main cause: birds raised without antibiotics were not consistently less affected (I-CHK-109). In one trial an antibiotic feed additive increased woody breast, but so did a probiotic, again through faster growth (I-CHK-110). Not every breast is affected, and the condition is a meat-quality and animal-welfare issue.

4. What remains unclear?

Exact causes; prevalence in specific markets.

5. Which studies support it?

I-CHK-11, I-CHK-108; partly I-CHK-110.

6. Which studies contradict it?

None on the existence of the condition; I-CHK-109 limits the attribution to antibiotics.

7. What applies to Germany and Europe?

Fast-growing broilers are standard in EU production; some retail/welfare schemes use slower-growing breeds [not reviewed in detail].

8. What is known about Egypt?

No Egyptian data reviewed.

9. What practical conclusion is appropriate?

The observation is correct; it says more about meat quality and animal welfare than about human health.

Assessment details

Rationale for certainty of evidence

Breast muscle myopathies (white striping, woody breast, spaghetti meat) are documented at large scale in modern fast-growing broilers in an expert review; aetiology linked to broiler genome, nutrition and management. Attribution to antibiotics specifically is not supported in the review abstract.

Source quality

Archive paraphrase plus Elawady's own words; consistent with poultry-science literature.

Regional transferability

Occurs in modern broiler production worldwide, including the EU and Egypt (fast-growing hybrids are used internationally) [Egyptian prevalence not reviewed].

Individual exceptions

Not applicable.

Regional scope of the claim
depends on production conditions
Last reviewed
26 October 2026 provisional

Scientific evidence in detail

True only under certain conditions – The claim holds only for certain doses, groups of people, preparations or circumstances.

Research question: In modern fast-growing broilers, how common is 'woody breast' (hard, wood-like breast muscle), and is it caused by intensive production (growth rate, management) and/or antibiotics?

Research question in detail (PECO)
Population
Commercial broiler chickens
Intervention or exposure
Fast growth/intensive production; antibiotic use
Comparison
Slower growth; antibiotic-free or organic production
Geographic scope
production-dependent (fast-growing hybrids used worldwide)
Outcomes
  • prevalence of woody breast
  • risk factors

Study results as reported by the authors. Our assessment follows below.

What speaks for the claim?

What speaks against the claim?

  • Antibiotic-free chickens still get woody breast

    Barbut S et al.. Poult Sci 2026 · PMID 42096902 · DOI 10.1016/j.psj.2026.106997 Cross-sectional studyabstract checkednewly added

    Comparison of conventional, antibiotic-free and organic systems (same genotype).

    Actual result
    Myopathies in all systems; antibiotic-free birds not consistently less affected; fillet weight strongly associated with severity.
    Methodological quality
    low (research note; n not in abstract)
    Relevance
    direct for the antibiotic attribution
    Limitations
    Inconsistent between years.

    Original publication

What does the overall evidence say?

Editorial assessment based on the studies above – not itself a study result.

Which position is better supported?

Woody breast is a real and common myopathy of fast-growing broilers, driven mainly by rapid growth and breast-muscle size; antibiotics are at most a minor contributor via growth.

Why some studies weigh more

Prevalence data (I-CHK-108) and expert review (I-CHK-11) establish the condition; production-system comparison (I-CHK-109) argues against antibiotics as main cause; one trial (I-CHK-110) shows antibiotic and probiotic both increased WB, pointing to growth as the common factor.

Is a causal relationship established? Probable Consistent association with growth rate and weight across studies; genetic selection for growth is the leading explanation.

Remaining uncertainty

Prevalence in Egypt and the EU; exact mechanism.

Justified conclusion

Correct: modern breast meat can be wood-like because of fast growth; not all breasts are affected, and it is a quality/welfare issue rather than a proven health hazard.

Why do studies seem to disagree?

I-CHK-110 (bacitracin increased WB) vs I-CHK-109 (antibiotic-free birds not less affected): both consistent with growth acceleration as the driver; the trial is a controlled setting, the field comparison reflects real production.

Does this depend on the country?
General biological effects
Myopathy biology linked to fast-growing genotypes.
Eating habits
Not relevant.
Origin of the food
Fast-growing hybrids are used in the EU and Egypt.
Contaminants
Not relevant.
National production conditions
Prevalence depends on slaughter weight, genotype and management; no Egyptian prevalence data found.
Legal rules
EU antibiotic growth-promoter ban does not prevent WB (I-CHK-109).
Actual monitoring data
No official monitoring of WB prevalence found.

A regional difference that changes the conclusion is not supported by robust data.

Statistical re-check
  • Binomial CI vs clustering – Reported 11.2-12.5% equals a simple Wilson CI; clustering by 37 flocks is not reflected, so precision is overstated. recalculated
Certainty of the overall evidence (GRADE, simplified)
Main outcome
Occurrence of woody breast in modern fast-growing broilers
Starting level
low (observational studies)
Reasons for upgrading
  • large effect / consistent across countries
Result
moderate

Simplified assessment by a single reviewer, following the GRADE approach; not a formal GRADE panel. GRADE rates the body of evidence for one outcome, not individual studies.

Search strategy

Documented literature searches for this review (search strings in the original database syntax).

DatabaseDateSearchLooking forHitsIncluded
Europe PMC26 October 2026(TITLE:"woody breast") AND (TITLE:prevalence OR TITLE:"growth rate" OR TITLE:"slow-growing" OR TITLE:genotype OR TITLE:strain OR TITLE:review)supporting evidence5
PubMed26 October 2026("woody breast"[tiab]) AND (prevalence[tiab] OR incidence[tiab]) AND (growth rate[tiab] OR slow-growing[tiab] OR genotype[tiab] OR antibiotic*[tiab])both directions10

Open questions

Prevalence in Egyptian broilers; whether consumer health is affected at all (see C-CHK-04).

How deeply was this checked?

4 linked studies: 0 checked in full text (0 of them with a structured risk-of-bias assessment), 4 on the basis of the abstract, 0 bibliographically only. No formal assessment with two independent reviewers and no independent human expert review has taken place yet.

Last scientific review: 26 October 2026

History of the verdict
  1. 25 October 2026 · Phase 1 · Initial assessment: Mostly true (moderate)
  2. 26 October 2026 · Phase 4 (systematic evidence review) · Re-examined with extended evidence; verdict unchanged: Mostly true (moderate)
    New prevalence and production-system data confirm the condition and its link to growth; they argue against antibiotics as the main cause. No change.
    New sources: I-CHK-108 I-CHK-109 I-CHK-110

In plain language

The claim that modern chicken breast can become hard like wood is based on a real problem. Fast-growing chickens often develop a muscle disorder called 'woody breast'. Experts consider it a serious quality and animal-welfare problem. Its cause is not fully known but is linked to fast growth, breeding and feeding, not specifically to antibiotics.

Studies on this claim

Studies supporting the claim (2)

  • Woody breast in modern chickens

    Greene ES et al.. Avian Pathol 2025 · PMID 40658058 · DOI 10.1080/03079457.2025.2533454
    Narrative reviewindependent cross-checkabstract checked

    Muscle disorders such as woody breast are widespread in fast-growing broilers.

    Because of intensive production, modern chicken breast has become 'like wood' (woody breast).

    Does the study support the specific claim? Yes · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim

    Original publication · Scientific details

    Study explained simply
    What did the researchers want to find out?

    Current knowledge on broiler breast myopathies

    How was the study done?

    Expert narrative review

    How many people, animals or samples were studied?

    Not applicable; Modern broilers

    What was actually found?

    Breast myopathies emerged at large scale; among the most significant economic and welfare challenges; no effective prevention; unknown aetiologies involving broiler genome, nutrition and management.

    How large was the observed effect?

    Not applicable

    What do the results mean in everyday life?

    A meat quality and welfare issue.

    What are the study's limitations?

    Narrative

    What does it say about Elawady's specific claim?

    Supports the observation.

    Do the results apply to Germany and Europe?

    High.

    What can explicitly not be concluded from this study?

    No human health data.

    Scientific details →

  • About 1 in 8 chicken breasts in Ontario were severely 'woody'

    Che S et al.. PLoS One 2022 · PMID 35427383 · DOI 10.1371/journal.pone.0267019
    Cross-sectional studyindependent cross-checkabstract checked

    Severe woody breast affected 11.8% of fillets, and almost all fillets had white striping.

    Severe woody breast in 11.8% of fillets; associated with heavier birds.

    Does the study support the specific claim? Yes · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim

    Original publication · Scientific details

    Study explained simply
    What did the researchers want to find out?

    How common are breast myopathies in Ontario broilers and what are the risk factors?

    How was the study done?

    Cross-sectional prevalence survey of fillets from 37 flocks with flock-level risk factors

    How many people, animals or samples were studied?

    9,250 fillets (250 from each of 37 flocks)

    What was actually found?

    Prevalence: spaghetti meat 36.3% (35.3-37.3), severe woody breast 11.8% (11.2-12.5), mild/moderate white striping 96.0% (95.6-96.4); 85.1% of fillets had multiple myopathies. WB odds increased with live weight (OR 1.23; 1.03-1.47) and in flocks not vaccinated against coccidia (OR 1.86; 1.51-2.29).

    How large was the observed effect?

    Prevalence: spaghetti meat 36.3% (35.3-37.3), severe woody breast 11.8% (11.2-12.5), mild/moderate white striping 96.0% (95.6-96.4); 85.1% of fillets had multiple myopathies. WB odds increased with live weight (OR 1.23; 1.03-1.47) and in flocks not vaccinated against coccidia (OR 1.86; 1.51-2.29).

    What do the results mean in everyday life?

    Woody breast is common in fast-growing chickens, but most breasts are not severely affected.

    What are the study's limitations?

    One province; CIs do not appear to account for clustering by flock (stats/C-CHK-03_woody_breast.py)

    What does it say about Elawady's specific claim?

    Supports the existence and frequency of the condition; links it to growth, not antibiotics.

    Do the results apply to Germany and Europe?

    Same fast-growing hybrids are used in the EU; prevalence may differ.

    What can explicitly not be concluded from this study?

    Says nothing about human health effects.

    Scientific details →

Studies contradicting or limiting the claim (0)

No studies in this group.

Studies with mixed or unclear results (2)

  • Antibiotic-free chickens still get woody breast

    Barbut S et al.. Poult Sci 2026 · PMID 42096902 · DOI 10.1016/j.psj.2026.106997
    Cross-sectional studyindependent cross-checkabstract checked

    Woody breast and related defects occurred in conventional, antibiotic-free and organic broilers; heavier fillets were more affected.

    Condition confirmed in all systems; antibiotic-free birds were not consistently less affected, so antibiotics are not the main cause.

    Does the study support the specific claim? Partly · Methodological quality: low · Certainty of evidence: see overall assessment of the claim

    Original publication · Scientific details

    Study explained simply
    What did the researchers want to find out?

    Does the production system (conventional, raised without antibiotics, organic) affect breast myopathies?

    How was the study done?

    Observational comparison of production systems within one fast-growing genotype over two years

    How many people, animals or samples were studied?

    not stated in abstract

    What was actually found?

    WS: no difference between conventional and RWA (about 85% with noticeable WS); organic similar. Severe WB more prevalent in RWA birds in 2024; in 2025 both organic and RWA had lower severe WB than conventional. SM severity consistently greater in RWA than conventional. Fillet weight strongly associated with myopathy severity in all systems.

    How large was the observed effect?

    WS: no difference between conventional and RWA (about 85% with noticeable WS); organic similar. Severe WB more prevalent in RWA birds in 2024; in 2025 both organic and RWA had lower severe WB than conventional. SM severity consistently greater in RWA than conventional. Fillet weight strongly associated with myopathy severity in all systems.

    What do the results mean in everyday life?

    The problem follows fast growth, not antibiotic use.

    What are the study's limitations?

    Sample size not in abstract; Inconsistent results between years; Research note

    What does it say about Elawady's specific claim?

    Confirms the 'wood-like' breast; limits the attribution to antibiotics.

    Do the results apply to Germany and Europe?

    Production systems similar to EU ones.

    What can explicitly not be concluded from this study?

    Cannot rank systems reliably (inconsistent between years).

    Scientific details →

  • An antibiotic feed additive increased woody breast in a trial

    Jia L et al.. Poult Sci 2022 · PMID 34788711 · DOI 10.1016/j.psj.2021.101512
    Animal studyindependent cross-checkabstract checked

    Bacitracin, a probiotic and a parasite challenge each increased woody breast in some conditions.

    Antibiotic feeding increased WB in one trial, but a probiotic did the same; growth is the common factor.

    Does the study support the specific claim? Partly · Methodological quality: low · Certainty of evidence: see overall assessment of the claim

    Original publication · Scientific details

    Study explained simply
    What did the researchers want to find out?

    Do management factors (antibiotic, probiotic, coccidial challenge) affect WB incidence?

    How was the study done?

    Randomised factorial feeding trial in broilers (3 diets x cocci challenge x sex)

    How many people, animals or samples were studied?

    not stated in abstract

    What was actually found?

    Cocci challenge increased WB incidence on d 29 and d 43. Bacitracin increased early growth rate (d 0-14). In unchallenged birds, both the antibiotic and the probiotic diets increased WB incidence on d 43 (P = 0.040). Males had higher WB incidence.

    How large was the observed effect?

    Cocci challenge increased WB incidence on d 29 and d 43. Bacitracin increased early growth rate (d 0-14). In unchallenged birds, both the antibiotic and the probiotic diets increased WB incidence on d 43 (P = 0.040). Males had higher WB incidence.

    What do the results mean in everyday life?

    Things that push growth can make woody breast more common.

    What are the study's limitations?

    Sample size not in abstract; WB assessed by palpation; Probiotic had a similar effect, so the link is not antibiotic-specific

    What does it say about Elawady's specific claim?

    Gives partial support to an antibiotic role, but via growth, not as a specific cause.

    Do the results apply to Germany and Europe?

    EU bans antibiotic growth promoters; finding has limited relevance for legal EU production.

    What can explicitly not be concluded from this study?

    Cannot show that antibiotics are the main cause in practice.

    Scientific details →

Regional context

Germany / EU

Fast-growing broilers are standard in EU production; some retail/welfare schemes use slower-growing breeds [not reviewed in detail].

Egypt

No Egyptian data reviewed.

What applies in my country?

General scientific assessment

Mostly true 'Woody breast' is real in fast-growing broilers; it is a quality and welfare issue.

The following areas of food safety are relevant to this statement:

  • Veterinary medicines and antibiotics
  • Hormonal growth promoters
  • Contaminants (heavy metals, PFAS, PCBs, dioxins, nitrate)
  • Pathogens (Salmonella, Campylobacter, etc.)
  • Animal husbandry and feed
  • Controls, imports, recalls, labelling

Poultry

Choose a country to see the checked information for it.

Limits: legal rules describe what is allowed, not what every single food contains. Measurement data come from samples and are meaningful only together with their method details.

Country of residence or purchase Compare with another country

References

  1. Breast muscle myopathies: twists and turns in modern broilers.. Greene ES et al.. Avian Pathol 2025 · PMID 40658058 · DOI 10.1080/03079457.2025.2533454
  2. Prevalence of breast muscle myopathies (spaghetti meat, woody breast, white striping) and associated risk factors in broiler chickens from Ontario Canada.. Che S et al.. PLoS One 2022 · PMID 35427383 · DOI 10.1371/journal.pone.0267019
  3. Research note: Influence of growing systems (conventional, organic, raised-without-antibiotics) on myopathies of broiler breast fillets.. Barbut S et al.. Poult Sci 2026 · PMID 42096902 · DOI 10.1016/j.psj.2026.106997
  4. Bacitracin, Bacillus subtilis, and Eimeria spp. challenge exacerbates woody breast incidence and severity in broilers.. Jia L et al.. Poult Sci 2022 · PMID 34788711 · DOI 10.1016/j.psj.2021.101512

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