If you have bad kidney, you can generally eat bananas, but if combined with significant edema or hyperkalemia then you should eat them appropriately. Because bananas contain a lot of sodium and potassium, if there is obvious edema or hyperkalemia, eating more bananas will make too much sodium and potassium into the body, which will aggravate edema and hyperkalemia and lead to the aggravation of the disease. So bad kidney can eat bananas, but for certain patients with comorbidities need to pay attention to the amount. The diet of patients with bad kidney requires low salt, low fat, high quality low protein, low potassium, and avoid intake of food containing high animal fats.