I think you must eat a lot of snacks and meat, and you don't like sports. Actually, there is no quick way to lose weight. As long as you persist, you will definitely lose weight. Because you 13 years old, it's time to grow up, so I don't recommend you to take any diet pills or anything. They are deceptive, will rebound, will not affect your health, and will never go on a diet. I suggest you exercise and lose weight at your age. In fact, you deliberately don't want to do any strenuous exercise. You can get up in the morning and run and walk as much as possible. Don't always sit and walk on the playground between classes. Take part in some sports you like, such as football and basketball. Don't always sit and move when watching TV and playing computer. In short, you should "move more" in your diet. You must eat three meals in the morning. You must eat in the morning and get up in the morning. Drink a cup of honey water to clear the intestines, and try to eat some light fruits and vegetables at night. Remember not to eat fried food and snacks, such as potato chips and chocolate. It takes some patience to lose weight. I hope my answer is helpful to you, and I wish you success in losing weight!