Atrial fibrillation (AFib) occurs when the normal rhythmic pumping of the upper chambers of the heart, called the atria, breaks down.
Instead of a normal heart rate, the atria pulse, or fibrillate, at a fast or irregular rate.
As a result, your heart is less efficient and must work harder.
AFib can increase a person’s risk for stroke and heart failure, both of which can be fatal if not treated quickly and effectively.
In addition to treatments like mediation, surgery, and other procedures, there are certain lifestyle changes, like your diet, that can help manage AFib.
This article reviews what the current evidence suggests about your diet and AFib, including what guidelines to follow and which foods to avoid.
Some foods can negatively affect your heart health and have been shown to increase the risk of heart complications, like AFib, as well as heart disease.
Diets high in processed foods, such as fast food, and items high in added sugar, like soda and sugary baked goods, have been linked to increased heart disease risk ( 1 , 2 ).
They can also lead to other negative health outcomes like weight gain, diabetes, cognitive decline, and certain cancers ( 3 ).
Read on to learn what food and drinks to avoid.
Drinking too much alcohol can increase your risk for developing AFib.
It may also trigger AFib episodes in people who already have AFib, especially if you have existing cardiovascular disease or diabetes ( 4 ).
Alcohol consumption can contribute to hypertension, obesity, and sleep-disordered breathing (SDB) — all risk factors for AFib (5).
While binge drinking is especially harmful, studies indicate that even moderate alcohol consumption can be a risk factor for AFib (6).
More recent evidence suggests that individuals who stick to recommended limits — two drinks per day for men and one drink for women — are not at increased risk for AFib (7).
If you have AFib, it’s best to limit your alcohol consumption. But going cold turkey might be your safest bet.
A 2020 study found that quitting alcohol significantly reduced arrhythmia recurrences in regular drinkers with AFib (8).
Over the years, experts have debated how caffeine affects people with AFib.
Some products that contain caffeine include:
- coffee
- tea
- guarana
- soda
- energy drinks
For years, it was standard to recommend that people with AFib avoid caffeine.
But multiple clinical studies have failed to show any link between caffeine intake and AFib episodes ( 9 , 10 ). In fact, regular caffeine consumption may even reduce your risk for AFib ( 10 ).
Although drinking coffee may increase blood pressure and insulin resistance initially, long-term studies have found that regular coffee consumption is not associated with higher cardiovascular risk ( 12 ).
A 2019 study found that men who reported drinking 1 to 3 cups of coffee per day were actually at a lower risk for AFib (13).
Consuming up to 300 milligrams (mg) of caffeine — or 3 cups of coffee — per day is generally safe (14).
However, drinking energy drinks is another story.
That’s because energy drinks contain caffeine at higher concentrations than coffee and tea. They’re also loaded with sugar and other chemicals that can stimulate the cardiac system ( 15 ).
Multiple observational studies and reports have linked energy drink consumption with serious cardiovascular events, including arrhythmias and sudden cardiac death (16, 17, 18, 19).
If you have AFib, you may want to avoid energy drinks, but a cup of coffee is probably fine.
Having obesity and high blood pressure can increase your risk for AFib, so it’s important to eat a well-balanced diet.
Cardiologists may recommend that you reduce certain types of fat if you have AFib.
Some research has shown that diets high in saturated and trans fats may be associated with an increased risk of AFib and other cardiovascular conditions ( 20 , 21 ).
Foods like butter, cheese, and red meat have high amounts of saturated fat.
Trans fats are found in:
- margarine
- foods made with partially hydrogenated vegetable oils
- certain crackers and cookies
- potato chips
- doughnuts
- other fried foods
A 2015 study found that diets high in saturated fat and low in monounsaturated fatty acids were associated with a greater risk of persistent or chronic AFib ( 22 ).
Monounsaturated fats are found in plant foods, including:
But swapping saturated fats with something else may not be the best fix.
A 2017 study found a slightly increased risk of AFib in men who replaced saturated fats with polyunsaturated fats.
However, other studies have linked diets high in omega-3 polyunsaturated fats with a lower risk of AFib.
It’s likely that less healthy sources of polyunsaturated fats, like corn oil and soybean oil, have different effects on AFib risk than healthy sources of polyunsaturated fats like salmon and sardines.
More high-quality research is needed to determine how polyunsaturated fats affect AFib risk.
The good news is, if you haven’t had the healthiest diet in the past, there’s still time to turn things around.
Australian researchers found that individuals with obesity who experienced a 10% weight loss could reduce or reverse the natural progression of AFib (23).
Excellent ways to address excess weight and improve overall heart health, include:
- reducing intake of high-calorie processed foods
- increasing fiber intake in the form of vegetables, fruits, and beans,
- cutting added sugar