As a nutrition expert, I can tell you that while bananas are a healthy fruit packed with essential nutrients like potassium, dietary fiber, and vitamin C, it's possible to overdo it with any food, including bananas. Bananas are high in potassium, which is a mineral that plays a crucial role in maintaining a steady heart rhythm. However, consuming excessive amounts of potassium, particularly for individuals with certain health conditions like kidney disease, can lead to hyperkalemia—a condition where there's too much potassium in the blood. This can be dangerous and affect the heart's ability to beat regularly. The average person doesn't need to worry about eating too many bananas in a day, as the body has mechanisms to regulate the balance of nutrients. However, for someone with kidney problems, even a few bananas could be problematic. In general, it's important to maintain a balanced diet that includes a variety of fruits, vegetables, and other food groups. Moderation is key, and while bananas are beneficial, eating them in moderation is the best approach. read more >>

It's hard to imagine someone eating 25 bananas in a day, much less 250. ... Potassium affects how steadily your heart beats, so eating foods with too much of it can be very dangerous to your heart. To control potassium levels in your blood, avoid foods like oranges, bananas, tomatoes, potatoes, and dried fruits."read more >>