Sure, genetics and metabolism have a lot to do with caloric intake and it's consumption into immediate energy. But if you're running on five cylinders instead of eight, sitting at a desk working, and not metabolising your food intake into physical energy, you get fat if you eat more caloric energy then you expend -- that's just math, plain and simple.

Those girls that eat all that sushi probably jog long distances, dance all night, or spend time in the gym. They don't just go home and lay on the couch watching TV.