Bananas are full of potassium which makes you more alert, hydrated, and can also prevent muscle fatigue. Since our bodies do not store potassium for very long, eating a banana is sure to increase any low levels of this nutrient.  Bananas contain natural sugars that will sustain your energy longer than coffee or energy drinks. They are also full of digestible carbohydrates and provide a great boost of energy for morning runners. Plus, they are lightweight and easy to carry, and are typically available all year long.