Compared with many foods, bananas are relatively low in calories, but
they are rich in antioxidants and healthy carbohydrates, which break
down into blood sugar for fuel. Bananas happen to be low in fiber and
are easily digestible, which means their sugar enters your body quickly
for a rapid energy boost. Because bananas tend to break down quickly
by themselves, their energy benefits might dwindle faster if you don’t
include them with a protein or healthy fat. Dip your banana in peanut
butter for an extra boost of protein.