It all depends on how healthy your gaming habits are. If you're the type who lives and breathes for an MMO and who can't reason outside of raid instances and guild meetups, you might be up for some problems down the road, especially psychologically and emotionally. Not to mention that sitting on your ass all day long and shoving empty calories down your gullet won't do your body any good.
If, on the other hand, you're a gamer who manages to balance it out with something else of an equally fulfilling nature (like a job that makes you feel appreciated, or another hobby outside of the gaming circuit - and ideally both), you're probably more likely to be able to work up the energy to take care of yourself.
If you're sensible about what you do, odds are you'll look more appealing to most people than someone who adheres to the "El Gordo Granudo" stereotype or who regularly channels the Comic Book Guy.
Personally, I find that a short walk each day works wonders. Give me twenty minutes of fresh air per day, and I'll work up enough enthusiasm for my job, my thesis, my assignments *and* my games.
As to whether or not that makes you pretty, I'd say that's a moot point. Before obsessing over your appearance, you're better off making sure that you're on the right mental and emotional track.
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