Only nobility would even be able to get enough food to be fat in that time. And besides, your constantly getting a workout, you would be fat for long.
And when's the last time you watched a movie where the hero was morbidly obeis.
Excuse me but who says I want to constantly get a workout in the game? Maybe I just want to sit in Hadvar's house all day eating sweetrolls. And chicken legs. And butter.
And yeah, maybe there aren't many morbidly obese heroes in movies. They're prejudiced against us as well! I've written countless letters to Hollywood about this asking them for a fat Jason Bourne or James Bond. The bad guys could be international criminal groups hell bent on crippling the western world's fast food industry. It'd be an absolute smash hit at the movies, all the fatties would like to watch James Bond single handedly save the western fastfood industry. You'd have to make extra large cinema seats to cope with the sheer PSI of all the fatties squeezing their way in. Maybe attatch emergency oxygen tanks to the back row seats for the ones out of breath after walking up the stairs. But dude, there SHOULD be morbidly obese heroes in movies. I'm just saying... there IS a place for them like in the example I just gave. You just need to use your imagination.