Strictly follow the principle of less salt, less sugar and less oil in diet. Do not drink or smoke. Drink a large glass of warm boiled water half an hour before meals to increase satiety. Eat less meals, eat more fruits and vegetables, eat less carbohydrates as far as possible as the staple food, and replace the staple food with coarse grains.

Parents only need to change their diet structure, such as eating less snacks, take-away, fried, barbecue and other deep-processed foods, cooking less oil and salt, replacing half of the staple food with brown rice, oats or corn potatoes, and choosing high-quality and high-protein foods, such as deep-sea fish and shrimp, chicken and beef. You will eat well and won't be hungry.