1. Nutritional balance is the basis for increasing children’s immunity 1.1 Nutrients required by children During the growth and development process, children need to absorb sufficient nutrients such as protein, carbohydrates, fats, vitamins and minerals to ensure the normal operation and functioning of various organs of the body. Healthy development of immunity. 1.2 Principles of food matching In order to provide children with more comprehensive nutrition, parents should pay attention to the principles of food matching, such as