However, one theory is that people with ADHD use substances to self-medicate. Kids with ADHD can never pay attention. Everyone loves a good movie and a little television, and both can be used for many different activities in the classroom. This can lead to relationship misunderstandings. What you eat can have a powerful effect on ADHD. Here is an elimination diet that has been shown to lead to massive improvements in symptoms of ADHD. Common symptoms of hyperactivity in adults include:.