My best friend is a size zero. She eats like no body's business, and she finally, FINALLY was able to walk into a store and the size zero jeans weren't loose anymore. There is nothing she can do about it shy of medication. Her metabolism is too fast, and she is just naturally as thin as a rail. All models are far too thin, but looking at Hana here, whose hair is healthy and skin seems to be as well, my suspicion is she gets all the nutrition she needs, which lends her skeletal like frame to the natural state of her body and not an eating disorder. You can look at the candid pictures of models to clue you in to the ones who might be eating nothing. Go take a look. Check the hair and the skin. I'll give you a hint: Adriana was lying when she said she eats all she wants and doesn't diet.