What are the ways to check food and nutrition for teenager?

My 15 years old son feels hungry all the time, and he loves to munch snacks at almost all the time. I understand that it becomes slightly difficult to control wrong eating habits at this age. I want to know about the required food and nutrition for my kid, as he is a picky eater. I have also heard about some food and nutrition chart, and I would like to confirm if it helps in deciding the food, I need to give my child to eat. Can somebody please assist me?

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