The thirteen-year-old girl is still a little girl. If she is not particularly obese, there is no need to lose weight deliberately. If you don't control the absorption of calories, you can't really lose weight with bath salts. The best way to really lose weight is to eat healthily and exercise. Do not eat high-calorie fried food, eat more fruits and vegetables, and exercise for more than half an hour every day.

Breakfast: you can eat more nutritious food, such as soybean milk or milk with white bread;

Lunch: eat seven or eight minutes full, you can eat meat side dishes, but you must not eat too oily and tender;

Dinner: The food for dinner should be light and half full. Generally, exercise before meals, but any exercise you like can be done, but it must last for more than half an hour, such as running, skipping rope, swimming, playing ball and so on.

It is not difficult to carry out the above method every day. As long as you persist, losing three or four pounds a month is not a problem. If you can't even do this, it's impossible to lose weight. Don't believe in slimming tea and bath salt to lose weight, lest you hurt yourself and spend money. To lose weight, we must pay attention to all aspects of diet and exercise.

I wish you success in losing weight. Please accept it as a satisfactory answer. Thank you.