How does diet affect your life?

Hi, I am 16 years old school going guy. Here is my complete question that I need help with. What do you know about school age children that have ADHD and their diet? What are the keys signs that school age children with ADHD are not on a proper diet or eating what they should be eating? What are the causes of a bad diet and how can it is remedied? What are some reasons school age children with ADHD, and a poor diet not get help? How does diet affect your life?
Please answer my questions. Thank you.

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valium