It seems impossible to lose weight by eating fruits, especially bananas, which are extremely energetic. If you eat them on an empty stomach, it is not good for your health. If you don't eat fruit as a staple food, you will get fat because they contain a lot of sugar. If you don't exercise, sugar will turn into fat. I suggest you eat a reasonable diet, such as eating 60% to 70% full and eating some fruit when you are hungry. In addition, try to use fruit.