This a stupid 質問 but its never been answered.

Got this off of Wiki Answers:

Wikipedia says, "The basal ganglia portion of the brain becomes very active when a person plays video games and watches TV. And the body releases a chemical called dopamine. Ritalin (and cocaine) also works on the basal ganglia of the brain and increase dopamine. もっと見る dopamine is released; the less neurotransmitter is available to do anything else. For that reason persons with illnesses related to dopamine unbalance like ADHD should the time spent on watching TV to a half-hour a day."
So that might answer your question. I'm too wired to read through it today, so I hope it helps!
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idk but why do あなた even want to know?

ya it really does thats why i mostly go outside

only if あなた see TV for a really long time または late nights

it does but only if あなた watch tv way to much あなた would have to watch tv for a night and a 日 for it to damage your brain