Fat around the heart, known as epicardial fat, responds well to both exercise and dietary changes. In studies, 12 weeks of regular exercise reduced this fat by 16% to 32%, and significant weight loss has cut it by as much as a third. Unlike the fat you can pinch on your belly, this fat sits directly on the heart’s surface, tucked beneath the membrane surrounding it. That location matters because it sits in direct contact with your coronary arteries and can release inflammatory substances that accelerate heart disease.
Why Fat Around the Heart Is Risky
Epicardial fat isn’t just dead weight. It actively produces inflammatory chemicals that promote plaque buildup inside your coronary arteries. These substances trigger a chain of damage: they cause the smooth muscle cells lining your arteries to multiply abnormally, increase oxidative stress, and even stimulate the growth of tiny new blood vessels within arterial plaques, making them more likely to rupture. The fat also contributes to insulin resistance, which feeds a cycle of metabolic problems that encourage even more fat storage.
People with epicardial fat thickness at or above 9.5 mm in men and 7.5 mm in women are at elevated risk for metabolic syndrome, a cluster of conditions that includes high blood pressure, high blood sugar, and excess abdominal fat. In one study, patients with epicardial fat thickness of 7 mm or more had significantly higher rates of hypertension and more severe coronary artery disease. Beyond artery blockages, excess heart fat doubles the risk of atrial fibrillation. A large Dutch study following nearly 2,000 adults for about eight years found that people in the top quarter of epicardial fat volume had roughly twice the risk of developing this irregular heart rhythm compared to those in the lowest quarter, even after accounting for other measures of body fat.
Sleep apnea appears to worsen the picture. In obese patients with obstructive sleep apnea, greater epicardial fat thickness independently predicted impaired heart rate recovery after exercise, a sign of disrupted autonomic nervous system function linked to poor cardiovascular outcomes. For every 1 mm increase in epicardial fat, heart rate recovery dropped by over 60%. If you snore heavily or wake feeling unrested, treating sleep apnea may be an important piece of reducing your cardiac risk.
Cardio Exercise Shrinks Heart Fat
Aerobic exercise is one of the most effective tools for reducing epicardial fat. A 12-week moderate-intensity aerobic program reduced epicardial fat thickness by about 16% in overweight individuals. A randomized trial published in JAMA Cardiology found even larger effects: three months of endurance training cut epicardial fat mass by 32% compared to a no-exercise control group in people with abdominal obesity.
You don’t need extreme workouts to see results. The studies showing significant reductions used structured programs of moderate aerobic exercise, things like brisk walking, cycling, or jogging, performed consistently over 12 weeks. The key is regularity rather than intensity.
Strength Training Has Unique Benefits
Resistance training reduced epicardial fat by 24% over three months in the same JAMA Cardiology trial. That’s slightly less than cardio’s 32% reduction for epicardial fat specifically, but strength training had a distinct advantage: it was the only exercise type that significantly reduced pericardial fat, the layer of fat just outside the heart’s protective sac. Resistance training cut pericardial fat by 31%, while endurance training had no meaningful effect on it.
The researchers noted that resistance training may actually be superior overall because it reduced both types of cardiac fat while also improving fitness and strength. The practical takeaway is that combining both cardio and strength training likely covers the most ground. But if you strongly prefer one type over the other, either will meaningfully reduce the fat sitting directly on your heart.
Diet Changes That Target Heart Fat
A Mediterranean-style diet, rich in olive oil, vegetables, fish, nuts, and whole grains, is associated with significantly less epicardial fat. In patients with atrial fibrillation, those with higher adherence to a Mediterranean diet had 55% lower odds of having elevated epicardial fat compared to those with lower adherence. This held up even after adjusting for traditional risk factors like age, weight, and blood pressure.
Substantial weight loss through calorie restriction produces dramatic results. Severely obese adults who lost 20% of their body weight over six months on a very low calorie diet saw their epicardial fat thickness drop by 32%, from an average of 12.3 mm down to 8.3 mm. That brought many of them closer to the healthy threshold range. While a very low calorie diet is an extreme approach, the principle holds: the more total body fat you lose, the more heart fat comes off with it. Epicardial fat behaves like other visceral fat deposits in that it tends to respond faster to weight loss than subcutaneous fat (the kind under your skin).
Medications That Reduce Epicardial Fat
Two classes of medications have shown notable effects on heart fat. GLP-1 receptor agonists, a category of drugs originally developed for type 2 diabetes and now widely used for weight management, reduced epicardial fat thickness by about 20% in just 12 weeks. Higher doses produced greater reductions, and the effect appeared to happen rapidly and independently of overall weight loss, since BMI changes in the study groups didn’t reach statistical significance over the same period.
SGLT2 inhibitors, another class of diabetes medication, also reduce epicardial fat. Interestingly, the heart itself doesn’t have the receptors these drugs target, but epicardial fat tissue does. The drugs work on heart fat through several pathways: improving blood sugar control, reducing lipid levels, promoting modest weight loss, and shifting the fat tissue’s inflammatory profile from harmful to protective. These medications aren’t prescribed solely for heart fat reduction, but if you’re already taking them for diabetes or heart failure, the effect on epicardial fat is an added cardiovascular benefit.
Putting It Together
Reducing fat around the heart comes down to the same core strategies that reduce visceral fat elsewhere in the body, but with some specific nuances. A combination of regular aerobic exercise and resistance training, performed consistently for at least 12 weeks, can reduce epicardial fat by roughly a quarter to a third. A Mediterranean dietary pattern is independently associated with lower heart fat, and meaningful weight loss amplifies every other intervention. Addressing sleep apnea, if present, removes a contributor to both cardiac fat accumulation and autonomic dysfunction. For people with type 2 diabetes, certain medications offer an additional layer of epicardial fat reduction on top of lifestyle changes.