Eating a healthy, balanced diet for your nutritional needs is not difficult, but it is trickier than you think.
Successful potassium diets are dependent on a number of other factors about your daily diet, state of health, medical need and well being.
Sodium, magnesium, maintaining a healthy diet, water intake, age, gender and current health condition are all critical factors.
In a medium sized banana there are 105 calories.
http://www.healthyweightforum.org/eng/calorie-counter/calories_banana/
not sure, but it is definitely better to eat them fresh, not ripe..