Oh please. Anyone can claim to be naturally skinny. How often do we see any of the girls eating, unless it's a part of a bigger scene. Lauren has flat out said that a number of the girls her cycle (didn't mention names) had strange eating habits. Girls who get the "eating disorder" edit (Cassie, Allison, Anamaria, etc) are just there so that Tyra can be shown expressing concern and rationalizing girls who are just as skinny staying and not having their eating rituals questioned.