Banana

Banana contains tryptophane, amino-acid that turns body to serotonine, known by the functions of relaxation, mood increasing and giving the feel of luck. It also contains the huge amount of potassium, that is very vital for muscle contraction and good work of nervous system. 

Compared with apple, banana has 4 times more proteins, 2 times more carbohydrates, 3 times more phosphorus, 5 times more vitamin A and iron and 2 times more of other vitamins and minerals.