I don't think the connection the OP is making is that binge gaming session == heart attack. I think it's that the person spent a lot of their time playing games. They spent too much time sedentary and this was the unfortunate result. It's something that can happen easily with games - some people find them very addictive (I don't have the attention span for gaming but I know people who have days where they wake up, play games, and go to sleep). The same result could happen if you sat and watched several movies every day and didn't exercise or eat well.
Considering most desk jobs are roughy equivalent to watching a few movies on end. What do you do then?
It's not so bad at small companies where socialising with freinds is not frowned upon. However at many large companies, spending 30 mins socialising would be frowned upon.
I think the difference is that at most desk jobs you get up every so often to use the bathroom, have lunch, get something from the printer, go to a meeting etc. And at the beginning and end of the day you have to move to go home. The problem is sitting in a chair playing a game (or another activity) and not getting off that chair for to do anything for a very long time (the gamers I know often sit for 12 hours only getting up to use the bathroom for a few minutes).
I honestly don't know very much about this but I think those minor distinctions are very important.
