Although the banana is associated with the American tropics, it originates from Asia. It is not only a popular but also a very valuable fruit plus it is delicious and easy to digest. Rich in carbohydrates and potassium it also improves your mood as it contains serotonin. The fiber contained in a banana positively influences metabolism and magnesium has a beneficial effect on the brain, muscles, bones structure and teeth. Thanks to simple sugars bananas also provide a quick boost of positive energy.