The Cavendish banana is the most highly cultivated banana. It is largely grown in Latin America, Africa, and Southeast Asia. The majority of bananas in the grocery store today are Cavendish bananas. A perfect snack when you are looking for an increase in energy and an elevation in your mood. Bananas contain high levels of tryptophan (the compound that gives you a relaxed feeling). Tryptophan turns to serotonin, the neurotransmitter in the brain that gives you that happy mood, and helps you sleep.