Is it good for children to eat children's protein powder?

Patient's question:

My child is currently taking children's protein powder. My friend said they saw online that protein powder is actually not good. If they eat it now and then stop, their body's immunity will be worse than before. They also said that it contains chemical ingredients that could cause infertility in children. Is that true? I'm very confused now.
Previous Treatment and Effects:
Previously, my child had slightly low immunity, but it has improved a bit now.
Kind of Help Needed:
Can they still focus on taking it?

Doctor's answer:

Proteins are essential substances for the human body, so if there is a deficiency in protein, it naturally interferes with the function of the immune system, making it easier to contract infections and leading to a decline in immunity. However, it doesn't mean that not eating protein in the future will weaken resistance, because if you pay attention to a balanced diet and consume plenty of high-quality proteins, it will not affect your resistance.
Advice: Since the child is already quite old, it is best to provide them with plenty of protein-rich foods. After all, the refinement of protein powder still cannot match the variety of foods. It is recommended to eat plenty of lean meat, liver, and other foods.

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