Atrial fibrillation (AFib) is a condition characterized by irregular heart rhythm. It can lead to blood clotting if left untreated. Several factors contribute to the development of the condition, including what one eats. Certain foods worsen the symptoms and frequency of AFib episodes, while others can support heart health and help alleviate the condition. So, here is a look at a few foods that can worsen AFIb and should be avoided: What is atrial fibrillation? Atria refers to the upper chambers of the heart. Atrial fibrillation is a heart rhythm disorder characterized by irregular and rapid electrical signals in the organ. When the signals become irregular, it leads to poor circulation of blood and heart palpitations, with the atria quivering instead of contracting as they normally would. Common symptoms one may experience with AFib are chest pain, trouble breathing, lightheadedness, fatigue, and dizziness. In the worst cases, it may lead to heart stroke and heart failure. Foods to avoid Coffee and energy drinks Coffee contains high levels of caffeine—a stimulant that is known to increase heart rate and worsen AFib episodes. Other beverages like energy drinks, black tea, and some soft drinks also are rich in caffeine and are best avoided or limited to avoid worsening the symptoms.