Drink warm water in the morning (you can drink several glasses of water a day, especially in summer), and you are only 13 years old. We should keep up with basic nutrition, eat well in the morning (eggs or something, not fried dough sticks), drink a bowl of clear soup before meals, mainly vegetables, eat less in the afternoon, eat more fruits when hungry (apples and peaches are full), and eat less after 5 pm.
You can get a summer job. . . . . . Don't stay at home and gain weight.