Why do bananas affect heart rate?

Bananas can affect heart rate primarily due to their high potassium content. Potassium is an essential mineral that helps regulate fluid balance, nerve signals, and muscle contractions, including the heart. Adequate potassium levels can support normal heart function and help prevent irregular heartbeats. However, consuming an excessive amount of potassium, especially in individuals with kidney issues, can lead to elevated heart rates or arrhythmias.