Consuming too much potassium can be harmful to those whose kidneys are not fully functional. If the kidneys are unable to remove excess potassium from the blood, it could be fatal. People who use beta-blockers should eat high potassium foods, such as bananas, in moderation.

Bananas are a great way to contribute to your daily potassium needs. Getting enough potassium in your diet may also help lower blood pressure. High blood pressure is one of the leading causes of cardiovascular disease, so eating foods containing potassium each day is an important part of a healthy lifestyle.

Bananas can aid digestion and help beat gastrointestinal issues. A medium banana will provide about 10-12% of your daily fibre needs. Singapore's Health Promotion Board recommends a daily dietary fibre intake of 20g for women and 26g for men. Soluble and insoluble fibres play an important role in your health.

Foods high in potassium also can interfere with some medications for high blood pressure and heart failure. It certainly would take more than one banana to raise potassium levels to a dangerous level for the average person, Spees said.