According to the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), people with chronic kidney disease should eat bananas and other high-potassium foods in limited amounts to prevent damage to their kidneys and heart. Kidney disease: People with end-stage kidney failure or undergoing dialysis should limit their potassium intake. Eating too many bananas can cause hyperkalemia, which can lead to serious heart health problems.
Hormone imbalance: People with hormone imbalance like low thyroid or PCOS should avoid bananas.
Allergies: Some people may be allergic to bananas. Migraine: Some people may experience migraine after eating bananas.
Medications: Certain medications for high blood pressure and heart failure should be avoided as well as foods rich in potassium.