Potassium-Rich Foods Linked to Heart Health

Reaching for bananas might do more than just enhance your morning smoothie. Recent international research indicates that a diet high in potassium could lower the risk of serious heart issues.

A study shared at a significant cardiac conference in Madrid, and published in the New England Journal of Medicine, shows that individuals with higher potassium levels were less prone to die from rhythm disorders, heart failure, or related complications.

Researchers from the University of Copenhagen followed 1,200 patients at high risk of ventricular arrhythmia, all of whom had implantable defibrillators (ICDs) in place. The participants had an average age of 62, with nearly 20% being female.

These participants were randomly assigned to one of several treatment groups aimed at boosting potassium levels. Options included potassium supplements, a drug therapy known as mineralocorticoid receptor antagonists (MRAs), or a combination of both, in addition to nutritional guidance and regular care. The second group received standard care only.

Among those in the first group, about 23% experienced serious medical incidents like dangerous fast heart rhythms, interventions from the defibrillator, unplanned hospitalizations due to heart complications, or even death. In contrast, the standard care group had a higher incidence, with 29.2% facing similar medical challenges—a 6.5% difference.

Unplanned hospital visits, lasting more than 24 hours, were notably less in the potassium group, reported at 29.5% compared to 33.2% in the standard care group.

Hospitalizations for abnormal potassium levels were similar across both groups. The researchers concluded that elevated potassium levels might lead to better health outcomes, reducing incidents like hospitalizations or death among patients with cardiovascular diseases at high risk for arrhythmia.

Dr. Christian Johns from Rigshospitalet, who presented the results at the Madrid conference, noted that previous observational studies hinted at the risks related to low plasma potassium levels and suggested normal potassium levels could offer protective effects.

Senior author Henning Bundgaard emphasized that the increase in potassium levels significantly eased the burden of arrhythmia without raising the risk of too much or too little potassium in the body. He added that the positive effects were consistent across various cardiovascular diseases, regardless of how potassium was raised, suggesting it’s a practical and cost-efficient method for treatment.

Experts commonly recommend potassium-rich options like bananas, avocados, and oranges, among other fruits, vegetables, dairy, and protein sources, as part of a healthy diet for heart health.