The Short Answer

Leaky gut, a condition where the intestinal lining becomes too porous, is common in autoimmune diseases and directly increases heart disease risk. When damaged intestinal walls allow bacteria and undigested food particles into the bloodstream, the immune system attacks them, triggering chronic inflammation that damages artery walls and promotes plaque buildup. Managing gut health is therefore essential for protecting both autoimmune function and heart health.

How Leaky Gut Triggers Chronic Inflammation and Arterial Damage

Many people think of heart disease risk only in terms of cholesterol, smoking, and blood pressure. But your heart health depends heavily on your gut health. Digestive problems, multiple food sensitivities, and chronic pain and inflammation are signs that your gut health may be endangering your heart. Poor gut health is linked with autoimmune diseases, including Hashimoto’s low thyroid, lupus, and rheumatoid arthritis, and failing to manage these factors can raise your risk of heart disease.

Leaky gut, also called intestinal permeability, occurs when the small intestine becomes inflamed, damaged, and overly permeable. This allows undigested food, bacteria, mold, yeast, and other pathogens into the bloodstream. The immune system views them as hostile and attacks them, causing inflammation. This ongoing inflammation sets the stage for autoimmune conditions and also plays a direct role in artery blockages and heart disease.

Inflammation from leaky gut may be a fundamental factor in arterial plaque and blockages. Patients with heart disease show higher incidences of leaky gut compared to control groups. Likewise, people with autoimmune diseases show a higher incidence of leaky gut. This is because the inflammation from leaky gut creates lesions on arterial walls. The body patches them with cholesterol, which eventually forms plaque in a process called atherosclerosis.

When Inflammation Weakens Arterial Plaque and Increases Heart Attack Risk

Inflammation not only promotes plaque formation but also weakens plaque stability in arteries. Stable plaque is important to prevent heart attacks. If plaque ruptures, it can come loose and block the artery, starving the heart of blood and causing a heart attack.

Leaky gut is a primary factor in chronic inflammation that not only clogs your arteries but also inflames your joints, causes skin issues, and affects the brain with symptoms of brain fog, depression, or memory loss. It triggers autoimmunity in genetically susceptible individuals. For example, in Hashimoto’s low thyroid, leaky gut is often present alongside the autoimmune attack on the thyroid. Inflammation affects each person differently, depending on genetics and environment.

How Pathogens From Leaky Gut Damage Heart Health

Leaky gut promotes arterial plaque and heart disease by allowing infectious bacteria and other pathogens into the bloodstream. Our guts house several pounds of bacteria, called our microbiome, which produce vital nutrients, activate antioxidant plant compounds, regulate metabolism and immune function, and influence brain health.

Many people today have unhealthy microbiomes lacking diversity and containing too much inflammatory bacteria. This helps explain rising rates of autoimmunity. Gut bacteria are also linked to obesity, triglyceride levels, and cholesterol levels. People with healthy blood lipid levels typically have healthier and more diverse gut bacteria.

One frequent contributor to poor digestive health and infection is H. pylori, the bacteria that cause stomach ulcers. H. pylori has been linked with irregular heart rhythms (atrial fibrillation), which increases heart failure risk. H. pylori infections are also common alongside leaky gut, creating a compounding effect on heart disease risk.

Contact RedRiver Health and Wellness to work with a functional medicine doctor who understands how autoimmune conditions and gut health affect your cardiovascular risk.