I'm asking because I'm curious.
My day has been strange all day - beginning with the power going out at my place this morning (it actually made for a peaceful morning), going to the Salt Lake Agile group this afternoon (very nice group, I like them), and ending up with car trouble along I-15.
Sometimes when I stress out, I gain - other times, the extra weight just slides right off.
I've heard both theories - stress causes the secretion of cortizone which creates more belly fat, and stress causes you to lose your appetite so you end up losing weight.
I've almost decided that the correct answer is "We don't know, so we're going to make it up and get you to accept our authority."