Come on, Nagato the answer: most probably you have more muscle and less fat!

I know this is a "LOL 'MURICA" joke and all, but the turkey leg isn't high-calorie, and she could totally pull an Atkins diet if she just ditched the bun and was drinking unsweet tea or diet coke or something. (In fact, as much as burgers are slammed for being high-calorie, if you actually READ the nutrition information they post on the walls, you can eat two whoppers for less calories than one whopper and the fries, because it's what's fried that kills you.)