I used to play WoW a ton. Maybe about five years ago when I was in high school, my favorite thing to do one summer was to wake up and have a cup of coffee while playing WoW in the morning, and then at noon make a hot pocket and a can of coke, and then whatever munchies I had in the house. I did that every day. I never really got overweight, but when I started losing my breath from like taking out the garbage (I have a long driveway), I knew something was wrong. I switched to nothing but water from then on. Feels so much better!
Edit: I meant I drink water as my only beverage. I still eat, usually healthier options. Before I quit WoW I would probably be eating peanuts or something while playing, inbetween meals.