Eating Eggs Linked to Atrial Fibrillation Risk, Study Finds
Eating Eggs Linked to Atrial Fibrillation Risk Through Gut Bacteria Compound, Study Suggests
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| New research examines the relationship between TMAO, a gut bacteria-derived compound, and atrial fibrillation risk. |
A compound produced when gut bacteria process nutrients found in animal foods has been linked to a higher risk of atrial fibrillation, an irregular heart rhythm that can increase the risk of stroke.
The finding comes from a Cleveland Clinic-led study published on July 24, 2026, in the Journal of Clinical Investigation. Researchers examined the relationship between blood levels of trimethylamine N-oxide (TMAO) and atrial fibrillation, while laboratory experiments explored how the compound may affect the heart's electrical activity.
Although egg yolks are a source of choline, a nutrient involved in TMAO production, the research does not establish that eating eggs directly causes atrial fibrillation or stroke. The study focused on TMAO levels and the biological pathway connecting gut bacteria with heart rhythm.
What the Cleveland Clinic Study Found
The research team, led by Robert Koeth, M.D., Ph.D., analyzed archived blood samples from 5,090 people in the Cleveland Clinic's GeneBank cohort. The participants were undergoing elective cardiac evaluation or procedures.
Researchers found that elevated blood TMAO levels were independently associated with prevalent atrial fibrillation after adjustments for other risk factors. The team also conducted laboratory and animal experiments to investigate whether TMAO could contribute to abnormal heart rhythms.
How Eggs and Other Foods Enter the Discussion
TMAO is produced through a process involving gut bacteria.
Certain nutrients, including choline and carnitine, can be metabolized by intestinal microbes into compounds that are subsequently converted into TMAO. Choline is found in several foods, including egg yolks, while carnitine is particularly associated with red meat.
This biological pathway is why the study has attracted attention in discussions about eggs and heart health. However, the presence of choline in eggs does not mean that consuming eggs automatically produces a harmful level of TMAO or leads to atrial fibrillation.
Does Eating Eggs Raise TMAO?
Earlier research provides an important qualification.
A randomized clinical trial published in 2021 examined the effects of eggs and choline supplements on TMAO levels in healthy adults with normal kidney function. Participants consuming four large eggs daily for four weeks did not show a statistically significant increase in fasting plasma TMAO, while groups receiving choline bitartrate supplements did show significant increases.
That earlier finding does not resolve every question about long-term dietary patterns or individual differences, but it shows why the relationship between eggs, choline, TMAO and cardiovascular health should not be reduced to a simple claim that eggs directly cause disease.
What Is Atrial Fibrillation?
Atrial fibrillation, often abbreviated as AF or AFib, is a heart rhythm disorder in which the heart's upper chambers beat irregularly.
The condition can cause symptoms such as:
Heart palpitations
Fatigue
Shortness of breath
Dizziness
Atrial fibrillation is clinically important because it can contribute to the formation of blood clots, which may travel to the brain and cause an ischemic stroke. It is also associated with other cardiovascular complications.
Having a risk factor associated with AF does not mean a person will necessarily develop the condition. Established risk factors include high blood pressure, coronary artery disease and obesity.
What Did the Animal Experiments Show?
The researchers also studied TMAO and choline in mouse models.
According to the published study, mice receiving diets supplemented with TMAO developed atrial fibrillation sooner in certain models. Dietary choline supplementation increased circulating TMAO levels and accelerated the onset of AF in the experimental animals.
The researchers also tested iodomethylcholine (IMC), an experimental compound designed to reduce TMAO production. In the mouse experiments, it reduced circulating TMAO levels and delayed choline-associated AF onset.
These results help explain a possible mechanism, but animal findings are not equivalent to proof of the same effect in humans. The experimental compound should not be interpreted as an established treatment for people.
Why the Findings Matter
The study adds to research into the relationship between the gut microbiome and cardiovascular disease.
Cleveland Clinic researchers have previously investigated TMAO in relation to heart disease, blood clotting and other cardiovascular outcomes. The new research focuses more specifically on how the gut-derived metabolite may affect the heart's electrical system and atrial fibrillation susceptibility.
The findings could eventually support research into preventive strategies that target the gut microbiome or TMAO-related pathways. But further human research is needed before translating the results into specific dietary recommendations or treatments.
Should People Stop Eating Eggs?
The study alone does not justify a blanket recommendation to stop eating eggs.
Eggs contain choline, an essential nutrient involved in normal bodily functions, including cell structure and nervous-system activity. The new research concerns a biological pathway and an association with atrial fibrillation—not a clinical trial showing that ordinary egg consumption causes the condition.
People concerned about heart rhythm, stroke risk or their diet should discuss their individual circumstances with a qualified healthcare professional rather than making major dietary changes based on a single news report.
The broader message from the research is that the interaction between diet, gut bacteria and cardiovascular health remains an active area of scientific investigation.
FAQ
Does eating eggs cause atrial fibrillation?
The study does not prove that eating eggs directly causes atrial fibrillation. It found an association between elevated blood TMAO levels and AF, while eggs contain choline, a nutrient involved in the pathway that can produce TMAO.
What is TMAO?
TMAO, or trimethylamine N-oxide, is a compound produced through a process involving gut bacteria and nutrients such as choline and carnitine. Elevated TMAO levels have been investigated in relation to cardiovascular disease.
What is atrial fibrillation?
Atrial fibrillation is an irregular heart rhythm that begins in the heart's upper chambers. It can increase the risk of blood clots and stroke.
What did the Cleveland Clinic researchers study?
The researchers analyzed blood samples from 5,090 people and conducted laboratory and animal experiments to examine the relationship between TMAO and atrial fibrillation.
Did an earlier study find that eggs increase TMAO?
A 2021 randomized trial found that eating four large eggs daily for four weeks did not significantly increase fasting plasma TMAO in the study participants, while choline supplements did increase TMAO.
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