First of all, bananas contain a large amount of dietary fiber, dietary fiber can easily make people feel full and play a role in suppressing appetite, and the decrease in human appetite will reduce the intake of food calories and play a role in weight loss. Secondly, the large amount of fiber in bananas can promote human intestinal peristalsis, help the human body laxative, relieve constipation, reduce the accumulation of human waste caused by poor digestion caused by the body weight gain. In addition, bananas contain organic acids and trace elements, which promote the speed of metabolism. The speed of human metabolism will consume part of the calories and take away part of the toxins, which has a positive effect on weight loss and slimming. Bananas contain sugar, can not be excessive consumption of bananas, excessive consumption of bananas can easily lead to the accumulation of sugar in the human body, causing the body to gain weight.