Gluten itself does not damage the heart in the vast majority of people, but in those with celiac disease, the immune reaction gluten triggers is linked to a meaningfully higher risk of cardiovascular problems. A large UK Biobank analysis found that people with celiac disease had a roughly 27% greater risk of cardiovascular disease overall compared with the general population. For people without celiac disease, the evidence runs in the opposite direction: higher gluten intake appears either neutral or slightly protective when it comes from whole grains. The relationship between gluten and the cardiovascular system, then, depends almost entirely on whether your body mounts an immune attack against it.
The Cardiovascular Burden of Celiac Disease
Celiac disease is an autoimmune condition in which eating gluten causes the immune system to attack the lining of the small intestine. For a long time, the concern was limited to gut damage and nutrient malabsorption. Over the past two decades, though, research has turned up a broader picture. People with biopsy-confirmed celiac disease face a higher risk of heart attack, atrial fibrillation, and venous blood clots compared with the general population.1PubMed Central. Celiac Disease and the Risk of Cardiovascular Diseases
The UK Biobank study, which followed hundreds of thousands of participants prospectively, put numbers on that risk. People with celiac disease developed cardiovascular disease at a rate of about 9 per 1,000 person-years versus roughly 7.4 per 1,000 person-years in people without celiac disease. After adjusting for standard cardiovascular risk factors like cholesterol and blood pressure, the association actually strengthened to about a 44% increased risk, suggesting that celiac disease contributes something to cardiovascular harm beyond the usual suspects.2BMJ. Association between coeliac disease and cardiovascular disease: prospective analysis of UK Biobank data The patterns held for ischemic heart disease and heart attack specifically, though the link with stroke was weaker and not statistically clear.
Why an Intestinal Disease Affects Blood Vessels
Celiac disease is fundamentally an inflammatory condition, and inflammation does not stay confined to the gut. Chronic, low-grade immune activation spills into the bloodstream and can reach distant organs, including the blood vessels and heart. One animal study identified a specific pathway: the inflammatory signaling molecule IL-17A, produced during active celiac disease, appears to act as a bridge between gut inflammation and vascular damage.3PubMed Central. Vascular dysfunction and arterial hypertension in experimental celiac disease are mediated by gut-derived inflammation and oxidative stress Oxidative stress compounds the problem, directly injuring the inner lining of blood vessels.
That vascular injury shows up in measurable ways. Celiac patients tend to have stiffer arteries than matched controls, even when their traditional risk markers like LDL cholesterol and triglycerides are actually lower. In one study, pulse wave velocity, a measure of arterial stiffness, was higher around the clock in celiac patients, alongside elevated markers of inflammation and insulin resistance.4PubMed. Increased arterial stiffness and its relationship with inflammation, insulin, and insulin resistance in celiac disease Separately, researchers using ultrasound found that the ability of blood vessels to dilate in response to increased blood flow, a key test of endothelial health, was significantly impaired in celiac patients compared with healthy controls.5PubMed. The evaluation of endothelial functions in patients with celiac disease
These changes have been observed in children as well. A pediatric study found that children with celiac disease had greater carotid artery wall thickness and stiffer carotid arteries than healthy peers, suggesting that vascular effects may begin early in the course of the disease.6Journal of Pediatric Research. Evaluation of Vascular Involvement in Children with Celiac Disease
Heart Muscle and the Pericardium
Beyond the blood vessels, celiac disease can directly involve the heart muscle itself, though this is uncommon. In a study of patients diagnosed with myocarditis, or inflammation of the heart muscle, more than 4% turned out to have undiagnosed celiac disease. These patients had lymphocytic infiltration of the heart tissue, cardiac autoantibodies, and no sign of viral infection, pointing toward a shared autoimmune process attacking both the gut and the heart.7PubMed. Celiac disease associated with autoimmune myocarditis
Encouragingly, a review of patients with celiac-related myocarditis and recurrent pericarditis found that a strict gluten-free diet alone resolved or improved symptoms in the majority of cases. Among those with pericarditis, all achieved complete symptom resolution; among those with myocarditis, heart function was restored in about four out of five patients.8PubMed Central. Celiac Disease and Inflammatory Cardiomyopathies: Exploring the Heart-Gut Axis Still, cases of celiac-related cardiomyopathy described in the broader literature are rare, and a systematic review found only a small number of patients with a confirmed concurrent autoimmune myocarditis diagnosis tied to celiac disease.9PubMed Central. Cardiomyopathy in Celiac Disease: A Systematic Review
Pericardial effusion, a buildup of fluid around the heart, has also been reported as a presenting sign of celiac disease. Case reports describe patients arriving with chest pain and shortness of breath who were ultimately found to have celiac disease as the underlying cause of their pericardial fluid.10PubMed Central. A Case of Pericardial Effusion in Association With Celiac Disease These are unusual presentations, but they illustrate how far the effects of untreated celiac disease can reach beyond the digestive tract.
Atrial Fibrillation Risk
One of the more robust cardiovascular associations with celiac disease is an increased risk of atrial fibrillation, the most common form of irregular heartbeat. A large Swedish cohort study following celiac patients for a median of nine years found a 34% increased risk of developing atrial fibrillation compared with the general population.11European Heart Journal. Increased risk of atrial fibrillation in patients with coeliac disease: a nationwide cohort study A meta-analysis pooling multiple studies confirmed this direction, estimating about a 38% higher odds of atrial fibrillation in celiac patients.12PubMed Central. Celiac Disease and Risk of Atrial Fibrillation: A Meta-analysis and Systematic Review
The mechanism likely involves the same chronic inflammation and autoimmune activation that drives the vascular problems. Systemic inflammation can disrupt the electrical signaling in the heart’s upper chambers, making irregular rhythms more likely. Whether strict gluten avoidance reduces this risk has not been conclusively demonstrated, but given that the inflammatory burden drops substantially on a gluten-free diet, it is a reasonable hypothesis.
Blood Clots and Thromboembolism
People with celiac disease also face a higher risk of venous thromboembolism, which includes deep vein thrombosis and pulmonary embolism. A Swedish population study of about 14,000 individuals with celiac disease found an 86% increased risk of subsequent venous clotting events, though the authors noted that some of this elevation could reflect surveillance bias and the chronic inflammatory state of the disease.13PubMed. Risk of thromboembolism in 14,000 individuals with coeliac disease Accumulating evidence suggests that a gluten-free diet may reduce the risk of these clotting events, along with the risk of ischemic stroke and heart attack.14PubMed. Thromboembolic complications and cardiovascular events associated with celiac disease
Several mechanisms likely contribute. Celiac disease can cause deficiencies in nutrients involved in clotting regulation, including vitamin K, folate, and vitamin B12. Elevated homocysteine, which has been documented in celiac patients, is itself a risk factor for clotting. And chronic inflammation promotes a prothrombotic state by activating platelets and clotting factors in the blood.
Gluten and Heart Health in People Without Celiac Disease
For the roughly 99% of people who do not have celiac disease, the story flips. Two large prospective studies, one American and one Japanese, have looked at what happens to cardiovascular risk when healthy adults eat more or less gluten. Neither found that higher gluten intake harmed the heart. The American study, following over 100,000 health professionals for more than two decades, found no association between gluten intake and coronary heart disease after adjusting for known risk factors. When the analysis separated the contribution of whole grains from refined grains, gluten coming from whole-grain sources was actually associated with a 15% lower risk of coronary heart disease.15BMJ. Long term gluten consumption in adults without celiac disease and risk of coronary heart disease: prospective cohort study
The Japanese study, which followed participants for about 16 years, found that those in the highest quartile of gluten intake had a 27% lower risk of dying from cardiovascular disease compared with those in the lowest quartile.16PubMed Central. Dietary Gluten Intake and Cardiovascular Disease Mortality in Japanese Adults in the Takayama Study The likely explanation is simple: gluten-containing whole grains carry fiber, minerals, and other compounds that benefit the heart. When people avoid gluten without a medical reason, they tend to cut out these foods and may replace them with less nutritious alternatives.
This is an important distinction that gets lost in popular health culture. Gluten avoidance has become fashionable well beyond the celiac population, but for people who tolerate gluten normally, eliminating it provides no cardiovascular benefit and may actually remove protective dietary components.
The Gluten-Free Diet Paradox
For people with celiac disease, a strict gluten-free diet is the only effective treatment, and it clearly helps reduce inflammation. A meta-analysis of studies examining the diet’s effect on cardiovascular risk factors found that it raised HDL cholesterol by about 5 mg/dL, lowered systolic blood pressure by about 3 mmHg, and reduced C-reactive protein, a marker of inflammation.17PubMed Central. Impact of gluten-free diet (GFD) on some of cardiovascular risk factors: a systematic review and meta-analysis Those are all moves in the right direction.
But the overall metabolic picture is more complicated. A large retrospective study of celiac patients found that while triglycerides and homocysteine dropped on a gluten-free diet, total cholesterol and BMI went up. The share of patients in the lowest cardiovascular risk category actually fell from about 58% to 47% after going gluten-free.18PubMed. Impact of gluten-free diet on cardiovascular risk factors. A retrospective analysis in a large cohort of coeliac patients A systematic review trying to sort through these mixed signals concluded that while a gluten-free diet changes certain cardiovascular risk factors in celiac patients, the overall effect on cardiovascular risk remains unclear.19PubMed. Effect of the gluten-free diet on cardiovascular risk factors in patients with coeliac disease: A systematic review
One study looking specifically at celiac patients’ lipid profiles found that while total cholesterol rose after starting a gluten-free diet, HDL cholesterol rose substantially too, and the ratio of LDL to HDL actually improved. The largest HDL increases were seen in patients who had been sickest at diagnosis.20PubMed. Change in lipid profile in celiac disease: beneficial effect of gluten-free diet So some of the cholesterol increase appears to reflect the body recovering from malabsorption rather than a genuine worsening of heart risk.
Perhaps more concerning is what happened in a study tracking celiac patients over 12 months on a gluten-free diet: metabolic syndrome, a cluster of conditions that raises cardiovascular risk, went from affecting about 2% of patients at diagnosis to roughly 30% after a year of gluten avoidance. Waist circumference, blood pressure, and blood sugar all increased substantially.21PubMed. Metabolic syndrome in patients with coeliac disease on a gluten-free diet This jump likely reflects a combination of improved nutrient absorption, weight recovery, and dietary choices that shift toward calorie-dense gluten-free processed foods.
The Quality Problem With Processed Gluten-Free Foods
Not all gluten-free diets are created equal, and the type of food people eat on these diets matters for cardiovascular risk. A comparison of gluten-free products and their conventional counterparts found that gluten-free versions tended to contain less protein and fiber but more saturated fat, carbohydrate, and salt.22PubMed Central. Nutritional quality and costs of gluten-free products: a case-control study of food products on the Norwegian marked Fewer gluten-free products qualified for a “high in fiber” nutrition claim.
Research on children with celiac disease made the practical implications of this clear. Those who relied heavily on processed gluten-free foods showed rising LDL cholesterol and fasting blood sugar over time, while children who ate naturally gluten-free foods like rice, potatoes, fruits, and vegetables did not show these unfavorable metabolic shifts.23PubMed Central. Effects of Gluten-free Diet on Lipid Profile Risk Factors in Celiac Children The takeaway for anyone on a long-term gluten-free diet is straightforward: building meals around whole, naturally gluten-free foods is far better for cardiovascular health than swapping in processed gluten-free bread, pasta, and snacks.
There is also a secondary concern about heavy metal exposure. Gluten-free diets tend to rely more heavily on rice, which can concentrate arsenic and mercury from soil and water. Studies based on national nutritional surveys have found that people on gluten-free diets have higher blood and urinary levels of these metals compared with people eating standard diets. The levels are well below toxic thresholds, but whether chronic low-level exposure carries any cardiovascular or other health consequences remains an open question.24PubMed Central. Heavy Metal and Rice in Gluten-Free Diets: Are They a Risk?
What About Non-Celiac Gluten Sensitivity?
Non-celiac gluten sensitivity is a condition where people experience gastrointestinal or other symptoms after eating gluten but do not test positive for celiac disease. Whether this condition carries the same cardiovascular risks as celiac disease is essentially unknown. The autoimmune intestinal damage that drives the vascular and cardiac complications in celiac disease does not occur in non-celiac sensitivity, so there is no strong biological reason to expect the same degree of cardiovascular impact. Reviews of the topic have noted the increased cardiovascular and mortality risk in biopsy-proven celiac disease but have not extended that conclusion to non-celiac sensitivity.25ScienceDirect. Celiac disease and non-celiac gluten or wheat sensitivity and health in later life: A review
If you experience symptoms from gluten but have ruled out celiac disease with appropriate testing, the available evidence does not suggest you face the same elevated cardiovascular risk. That said, this is a poorly studied area, and firm conclusions would be premature.
Shared Genetics Between Celiac Disease and Heart Disease
One question researchers have explored is whether the genes that predispose someone to celiac disease also independently raise heart disease risk. A study examining 41 genetic variants associated with celiac disease found that about 59% of them showed a positive, though mostly tiny, association with coronary artery disease. Only one variant, at a locus called SH2B3/ATXN2, reached statistical significance for being associated with both conditions in a consistent direction.26Springer Nature. Genetic variants associated with celiac disease and the risk for coronary artery disease The overall proportion of shared risk alleles was not significantly different from what you would expect by chance, suggesting that the cardiovascular risk in celiac disease comes primarily from the inflammatory disease process rather than from a shared genetic blueprint.
This finding is actually reassuring in a way. It means the cardiovascular risk associated with celiac disease is likely modifiable: treat the disease, calm the inflammation, and much of the excess risk should diminish. It is not baked into the genome in the way that some inherited cardiovascular conditions are.
Gluten-Free Diets in Healthy Athletes
The popularity of gluten-free diets among competitive athletes, often promoted as a way to reduce inflammation and improve performance, deserves a reality check. A controlled trial in non-celiac athletes found no difference in exercise performance, gastrointestinal symptoms, or inflammatory markers between a gluten-containing diet and a gluten-free diet over a short period.27PubMed. No Effects of a Short-Term Gluten-free Diet on Performance in Nonceliac Athletes Markers of intestinal damage and systemic cytokines were essentially identical on both diets. For athletes without celiac disease, going gluten-free does not reduce inflammation or provide any measurable cardiovascular or performance edge, and it may make it harder to get adequate fiber and whole-grain nutrients that genuinely support heart health.