If there is no suggestion of stomach trouble or anemia, drink white water. Functional drinks should not be drunk excessively. If you are hungry before exercise, eat some foods with high starch content, such as bread. Try to eat vegetables and protein foods after exercise. It is not advisable to eat foods with high fat content or eat too much. Aerobic exercise is a protracted war to lose weight. You must keep a good amount of exercise and exercise times, as well as good living habits. Success belongs to the persevering. Come on!