Why is it bad to eat a full banana?

Banana = Good: The average banana is only 105 calories. Bananas are a good source of potassium, b vitamins, vitamin c and magnesium. Bananas don’t contain any fat or cholesterol. A remedy for a mosquito bite – rub the bite with the inner part of banana skin to v swelling/ irritation. Bananas contain tryptophan which becomes converted to serotonin. So eating a banana might lift your mood.