Dear Reader, Actually, bananas are only moderately high in potassium. It's needed for a variety of body functions, including fluid balance, normalizing blood pressure, muscle contraction, and transmission of nerve impulses. Sweating during strenuous exercise, dieting, diuretic or laxative use, vomiting, or diarrhea can decrease our potassium levels.
Severe losses can result in heart arrhythmias, confusion, nerve damage, and paralysis.
Including foods in your diet that are rich in potassium is the best way to replace any that is lost.