Yes, if you gain muscle, you can eat carbohydrates after exercise. In addition, according to the previous theory, carbohydrate should be supplemented within half an hour after exercise, and the demand in protein will peak in about half an hour, so protein needs to be supplemented. Of course, there are also some statements that do not have such hard and fast rules. But in any case, it is ok to eat something after exercise. If it is to reduce fat, I won't say much. Obviously, you should not eat more at any time.