Note: There is now an update to this post, please see: http://outofbetablog.blogspot.com/2013/09/learning-and-evolving-or-weight-in.html
This isn't a topic I see often discussed in the arena of gaming, but I think it's relevant all the same. I am not going to sit and argue as to whether weight is an "-ism"; we can go around and around about "choice" or "predisposition". That is not the topic I want to go into though, instead I want to focus on how it is depicted in gaming, and why the modern trend is problematic. We hear a lot about race, gender, sexual orientation, and classism but I rarely hear people mention ableism or related issues with regards to gaming.
Remember, characters in games don't exist, they don't need to eat, sleep, work-out, have sex; they appear as an artist CHOOSES them to appear. If a female character appears in skimpy armor, it's because an artist chose to put her in it, not because "she likes to be sexy". We can flesh out these characters to justify those design choices, but how we choose to depict a character and the attitude we set around them are decisions the creators make.
Before I dive in, I may use words accidentally that might offend, but I do not intend to. If you, a reader, discover a word related to weight used pejoratively or insensatively, it is not intended. Point it out and I will happily remedy this.