Egg-yolk phosphatidylcholine is converted by gut bacteria into TMAO, and therefore eggs raise the risk of major cardiovascular events (about 2.5-fold).
Original statement
تحدّي صفار البيض الغذائي يرفع مستوى مستقلب TMAO الناتج عن بكتيريا الأمعاء، وارتفاع TMAO في الدم يرتبط بزيادة خطر الحوادث القلبية الوعائية الكبرى بمعدل 2.5 ضعف.
verbatim according to source. Translation by the project; the Arabic wording is authoritative.
Translation
Egg-yolk phosphatidylcholine is converted by gut bacteria into TMAO, and therefore eggs raise the risk of major cardiovascular events (about 2.5-fold).
Origin
- Source status
- Archive editors
- Attribution
- Archive editors (not Elawady)
- Origin
- https://eltayebat.com/rule/industrial-eggs/
- Attribution uncertainty
- Narrative and study selection written by the archive operators; the archive states the forbidden section is documented independently of Dr. Diaa's words.
- Claimed mechanism
Gut-microbial metabolism of choline/phosphatidylcholine to trimethylamine and then TMAO, which is proatherogenic.
- Claimed health effect
Major adverse cardiovascular events.
- Population concerned
general population (not specified)
- Geographic restriction by Elawady
none found
Scientific assessment
Potentially false – The available evidence tends to speak against the statement, but is not conclusive.
Certainty of evidence: low – Further research is likely to change the assessment considerably.
1. What was claimed?
Egg yolk is turned into TMAO by gut bacteria, and high TMAO is linked to a 2.5-fold risk of heart attack, stroke or death.
2. What is demonstrably correct?
Tang et al. (NEJM 2013) showed in a challenge study (40 people; antibiotic sub-study 6 people) that after two hard-boiled eggs plus labelled phosphatidylcholine, TMAO rose and that this depended on gut bacteria. In 4,007 cardiology patients, the highest vs lowest quartile of plasma TMAO had an unadjusted HR of 2.54 (1.96-3.28) for major cardiovascular events; after adjustment for risk factors, kidney function and extent of coronary disease, the HR was 1.43 (1.05-1.94).
3. What is wrong or exaggerated?
The archive's '2.5-fold' figure is the unadjusted hazard ratio, and it refers to blood TMAO levels in patients undergoing coronary angiography, not to eating eggs; egg intake was not measured in the outcome cohort (A-EGG-13). In an RCT (I-EGG-10), healthy people eating 4 eggs daily for 4 weeks had no significant increase in fasting TMAO or platelet reactivity, while choline supplements did. Cohort data on egg intake and CVD do not show the risk implied (C-EGG-04).
4. What remains unclear?
Whether TMAO is a cause or a marker of cardiovascular risk (e.g., of kidney function) is still debated.
5. Which studies support it?
A-EGG-13 (mechanism and TMAO-outcome association).
6. Which studies contradict it?
I-EGG-10 (eggs did not raise fasting TMAO); I-EGG-01, I-EGG-02 (no association of egg intake with CVD).
7. What applies to Germany and Europe?
Not region-specific.
8. What is known about Egypt?
Not region-specific.
9. What practical conclusion is appropriate?
The TMAO pathway does not provide evidence that eggs in usual amounts increase cardiovascular events.
Assessment details
- Rationale for certainty of evidence
The mechanistic link TMAO-CVD is an observational association plus animal data; the hazard ratio of 2.54 refers to TMAO quartiles in cardiology patients, not to egg intake. A 4-week RCT found that 4 eggs/day did not raise fasting TMAO, while choline bitartrate supplements did. Small trials; certainty low.
- Source quality
Archive featured card; the cited NEJM study is real and correctly quoted, but the archive's derivation (eggs -> 2.5-fold risk) merges two separate parts of the study.
- Regional transferability
Biological mechanism; not region-dependent.
- Individual exceptions
People with impaired kidney function have higher TMAO levels; relevance of dietary choline sources in them is less clear.
- Regional scope of the claim
- general (biological/medical)
- Last reviewed
- 25 October 2026 provisional
In plain language
The archive says egg yolk is turned into a substance called TMAO by gut bacteria and that this makes heart attacks 2.5 times more likely. The 2.5-fold number comes from comparing heart patients with high and low TMAO blood levels, before taking other risk factors into account; after adjustment the difference was about 1.4-fold. The study did not measure how many eggs these patients ate. A later trial found that eating four eggs a day for four weeks did not raise TMAO, while choline pills did.
Studies on this claim
Studies supporting the claim (1)
-
Gut bacteria, TMAO and heart risk
Tang WH et al.. N Engl J Med 2013 · PMID 23614584 · DOI 10.1056/NEJMoa1109400Cohort studycited by the Tayebat archivefull text checked★ key studyGut bacteria make TMAO from egg-yolk components; heart patients with the highest TMAO had more events (about 1.4-fold after adjustment, 2.5-fold unadjusted); egg eating itself was not studied against outcomes.
Egg-yolk phosphatidylcholine is converted by gut bacteria into TMAO, and therefore eggs raise the risk of major cardiovascular events (about 2.5-fold).
Does the study support the specific claim? Partly · 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?
Is gut-microbial metabolism of dietary phosphatidylcholine to TMAO linked to adverse cardiovascular events?
- How was the study done?
Human feeding challenge with antibiotic suppression plus prospective cohort of cardiology patients
- How many people, animals or samples were studied?
40 healthy adults (6 given antibiotics) for the egg challenge; 4,007 heart-catheterisation patients for outcomes
- What was actually found?
TMAO rose after eating eggs and was blocked by antibiotics. Highest vs lowest TMAO quartile: HR 2.54 unadjusted, 1.43 (1.05-1.94) after full adjustment, for death, heart attack or stroke within 3 years.
- How large was the observed effect?
Cox regression; HR
- What do the results mean in everyday life?
Shows a mechanism, not the effect of eating eggs.
- What are the study's limitations?
Egg intake not measured in the outcome cohort; effect shrinks markedly after adjustment (incl. kidney function); high-risk population; antibiotic test in only 6 people.
- What does it say about Elawady's specific claim?
Partly supports; does not show eggs cause events.
- Do the results apply to Germany and Europe?
Not region-specific.
- What can explicitly not be concluded from this study?
Cannot show that eating eggs increases cardiovascular events, nor a 2.5-fold risk from eggs.
No study in this group is marked as key.
Studies contradicting or limiting the claim (3)
-
Do eggs raise TMAO? A trial
Wilcox J et al.. Am J Med 2021 · PMID 33872583 · DOI 10.1016/j.amjmed.2021.03.016Randomised controlled trialindependent cross-checkfull text checked★ key studyEating four eggs a day for four weeks did not raise fasting TMAO; choline pills did.
Egg-yolk phosphatidylcholine is converted by gut bacteria into TMAO, and therefore eggs raise the risk of major cardiovascular events (about 2.5-fold).
Does the study support the specific claim? No · 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?
Do eggs raise TMAO and platelet reactivity?
- How was the study done?
Randomised intervention study with 5 arms, 4 weeks
- How many people, animals or samples were studied?
82 (18+20+16+18+10); Healthy volunteers with normal renal function (median age 28; 41% male; 81% Caucasian)
- What was actually found?
Fasting plasma TMAO did not rise significantly with 4 eggs/day (median 2.0 to 2.3 uM; P=0.20) or with phosphatidylcholine capsules (P=0.27), but rose strongly in all three arms with choline bitartrate tablets (e.g. 1.9 to 11.1 uM; P<0.0001). Platelet reactivity rose only in the choline-tablet arms; eggs P=0.10.
- How large was the observed effect?
Within-arm comparisons
- What do the results mean in everyday life?
Eggs do not appear to raise this heart-risk marker in healthy people.
- What are the study's limitations?
Small arms (10-20); fifth arm added later (not randomised concurrently); no placebo arm; diet not controlled; only fasting samples; 4 weeks; healthy young adults with normal kidneys
- What does it say about Elawady's specific claim?
Contradicts.
- Do the results apply to Germany and Europe?
Not region-specific.
- What can explicitly not be concluded from this study?
Cannot exclude a small or postprandial TMAO rise, nor effects in people with kidney disease, and says nothing about heart attacks or strokes.
-
Eggs and heart disease: 1.7 million people
Drouin-Chartier JP et al.. BMJ 2020 · PMID 32132002 · DOI 10.1136/bmj.m513Meta-analysisindependent cross-checkfull text checked★ key studyEating up to one egg a day was not linked to heart disease or stroke.
Egg-yolk phosphatidylcholine is converted by gut bacteria into TMAO, and therefore eggs raise the risk of major cardiovascular events (about 2.5-fold).
Does the study support the specific claim? No · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Is egg intake associated with cardiovascular disease risk?
- How was the study done?
Three prospective US cohorts (NHS, NHS II, HPFS) plus systematic review and dose-response meta-analysis of prospective cohorts (PROSPERO CRD42019129650)
- How many people, animals or samples were studied?
215,618 cohort participants (14,806 CVD events); meta-analysis 33 estimates, 1,720,108 participants, 139,195 CVD events; US women and men free of CVD, diabetes and cancer; meta-analysis of global cohorts
- What was actually found?
Cohorts: an egg a day or more vs <1 per month HR 0.93 (0.82-1.05). Meta-analysis per egg/day: CVD 0.98 (0.93-1.03); Asia 0.92; in people with type 2 diabetes possibly higher risk (1.25, 0.99-1.59).
- How large was the observed effect?
Pooled Cox models; random-effects meta-analysis
- What do the results mean in everyday life?
For most people, an egg a day is not linked to heart risk.
- What are the study's limitations?
Observational; egg eaters had less healthy profiles (residual confounding possible); heterogeneity; few people above one egg a day; possible higher risk in type 2 diabetes is uncertain.
- What does it say about Elawady's specific claim?
Contradicts the archive claim.
- Do the results apply to Germany and Europe?
European cohorts: no association.
- What can explicitly not be concluded from this study?
Cannot prove absence of any effect at high intakes or in people with type 2 diabetes.
-
Eggs, cholesterol and heart disease in 50 countries
Dehghan M et al.. Am J Clin Nutr 2020 · PMID 31965140 · DOI 10.1093/ajcn/nqz348Cohort studyindependent cross-checkabstract only checked★ key studyEating an egg a day was not linked to cholesterol levels, heart disease or death.
Egg-yolk phosphatidylcholine is converted by gut bacteria into TMAO, and therefore eggs raise the risk of major cardiovascular events (about 2.5-fold).
Does the study support the specific claim? No · Methodological quality: high · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Is egg intake associated with blood lipids, CVD and mortality across income levels?
- How was the study done?
Prospective cohort analyses of PURE and of patients in ONTARGET/TRANSCEND trials
- How many people, animals or samples were studied?
146,011 (PURE) + 31,544 (trials); PURE general population (21 countries) and patients with vascular disease (ONTARGET/TRANSCEND)
- What was actually found?
PURE >=7 vs <1 egg/week: composite HR 0.96 (0.89-1.04); mortality 1.04 (0.94-1.15); major CVD 0.92 (0.83-1.01); no association with lipids. ONTARGET/TRANSCEND similar (composite 0.97, 0.76-1.25).
- How large was the observed effect?
Cox frailty models
- What do the results mean in everyday life?
Moderate egg intake appears neutral worldwide.
- What are the study's limitations?
Single FFQ; Few very high consumers
- What does it say about Elawady's specific claim?
Contradicts.
- Do the results apply to Germany and Europe?
Includes European countries.
- What can explicitly not be concluded from this study?
Cannot exclude small effects.
No study in this group is marked as key.
Studies with mixed or unclear results (0)
No studies in this group.
Regional context
Germany / EU
Not region-specific.
Egypt
Not region-specific.
- Antibiotic (veterinary drug) residues in poultry meat and eggs
- Antimicrobial use in food animals and antibiotic growth promoters
- Salmonella in laying hens, eggs and broiler chicken
- Dioxins, PCBs and PFAS in eggs and other animal foods
- Import controls and the meaning of RASFF notifications for Egyptian products
What applies in my country?
General scientific assessment
Potentially false The TMAO argument mixes a blood marker with egg intake; a trial found eggs did not raise fasting TMAO.
The following areas of food safety are relevant to this statement:
- Veterinary medicines and antibiotics
- Contaminants (heavy metals, PFAS, PCBs, dioxins, nitrate)
- Pathogens (Salmonella, Campylobacter, etc.)
- Animal husbandry and feed
- Controls, imports, recalls, labelling
Eggs
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
- Intestinal microbial metabolism of phosphatidylcholine and cardiovascular risk.. Tang WH et al.. N Engl J Med 2013 · PMID 23614584 · DOI 10.1056/NEJMoa1109400
- Dietary Choline Supplements, but Not Eggs, Raise Fasting TMAO Levels in Participants with Normal Renal Function: A Randomized Clinical Trial.. Wilcox J et al.. Am J Med 2021 · PMID 33872583 · DOI 10.1016/j.amjmed.2021.03.016
- Egg consumption and risk of cardiovascular disease: three large prospective US cohort studies, systematic review, and updated meta-analysis.. Drouin-Chartier JP et al.. BMJ 2020 · PMID 32132002 · DOI 10.1136/bmj.m513
- Association of egg intake with blood lipids, cardiovascular disease, and mortality in 177,000 people in 50 countries.. Dehghan M et al.. Am J Clin Nutr 2020 · PMID 31965140 · DOI 10.1093/ajcn/nqz348