I don't know how old your child is. It's not good if you are too fat. I suggest starting from the following aspects:

1, lead children to exercise more, exercise is the foundation of health.

2. Pay attention to children not to eat snacks, sweets, overeating, and pay attention when eating. Don't play or watch TV while eating.

3. Suggest that children eat more vegetables, eat less meat and fried food, and reduce the intake of staple food.