9-year-old children are good at losing weight when they grow up. First of all, they are full for three meals a day. They can eat an egg in the morning and a bowl of porridge at noon, but they can only eat seven points full. In the evening, they can eat boiled vegetables or a piece of beef. They must not eat rice flour steamed bread, because carbohydrates are beneficial to the body's absorption. After eating, they can do some jumping rope, walking and other sports, and they will definitely lose weight after half a month.