How are playing video games bad for you

Because you don't get any exercise and you (Can) get really fat. You can play them. Just not to many.
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That isnt just it, even though youve got 80% of it. :)
They can be bad for you because if your and not outside for 20 minutes for atleast 3 days a week. You will not get Vitamin D from the sun. This can cause things like random Belly Aches, Bathroom Issues, Etc;. Make sure if your playing games, and not going outside often, To not eat to much foods. Its okay if you eat some unhealthy foods, like spaghetti-O's (for example) as long as you eat a fruit, like a banana (for example). I think you would only need 2 meals a day. Like me, i just eat a fruit for breakfest, then lunch and linner(lunch+dinner) only because, since your not running around and burning up those bad calories, it will just settle in your belly.
<3Bye!<3
Hope this helps!