I'd agree with it being diet over lifestyle. Calories in, Calories out...if you are only eating the calories that you burn in a normal day of sitting on a computer then, you are fine. If you are eating a cheesburger every day while you play and drinking beer every night you raid...yes, you will become fat eventually.
Sadly, in this day and age, more than likely they will become overweight, but I think that can be said for anyone now a days, not just gamers. Too many people are dependent on computers and tv and not enough people spend the time to go to a gym or outside like 10+ years ago...And fast food is cheaper than eating healthy most of the time, sadly...
And with that said...i'm going to go eat a turkey dog with some carrots and unsweet tea! (and i'm insanely sore from the workout I did this morning!) :P
I walk everyday to and from work, just a tad over a mile each way, but my job has almost no physical work involved. I need to get back on the track, treadmills suck, rather get outside. ALL fast food is bad for you, don't tlet that "healthy choices" menu at your local McD's fool you.
Generally skinny when young means your healthy just for the fact you are young
What does this mean ?
I'm not basing this off anything other than personal experience, but skinny teens/young adults are usually so just because of hereditary reasons and a quick metabolism. Their diets are terrible. Most don't eat breakfast, and have terrible lunches. They aren't, by any means, healthy. Of course, being young, their body produces cells at a much higher rate which compensates for the lack of a good diet.
Our perception of what's healthy is completely and utterly skewed. Big buff guys and skinny girls are perceived as the 'healthy' models. How many of these buff guys eat a well balanced diet, and keep their heart healthy ? Are these skinny girls really healthy ? Or have they just learned to count calories, and limit themselves to the bare minimum ?