Bananas are rich in dietary fiber, which can stimulate gastrointestinal peristalsis and help excretion. If you don't eat anything but honey bananas, the calories are much lower than dinner, and you will naturally lose weight. However, such a rapid weight loss, the body often produces adverse reactions because there is no good adjustment. If you eat bananas for a long time, and your body is short of protein, minerals and other nutrients, slowly your body will send out a danger alarm.