Bananas are higher in sugar (glycemic index), but have essential vitamin & mineral components that are ideal for athletes & those who regularly exercise that may benefit from this food.
Bananas are a great source of potassium, fiber, magnesium & minerals. For those in a regular workout routine, it may provide the additional boost of energy that is fuel to endure aggressive workouts. It can also provide great post exercise effects, replenishing energy stores, repair muscle tissue & balance water retention.
Since bananas contain relatively high amounts of sugars from carbohydrates, they can easily spike up your blood sugar levels. This may be problematic for those who are diebetic, pre-diebetic, or individuals who has any form of insulin resistance. This is not a food that is ideal for those who have trouble keeping blood sugar at a steady state, or to those who have difficulty losing weight due to its higher glycemic index.
The best substitute for bananas for those watching their calories from sugar? Here's a few: berries, peaches, & apples. These fruits contain less sugar content and can regulate blood sugar levels at a steady state. These are some things to consider if you're looking to incorporate Bananas and/or fruits in general to your diet.