Yes, it's crazy. It is far more unhealthy to be waif-thin than it is to be 40 pounds overweight. Women who look like this are actually in the process of eating their own muscles off their bones, since the body MUST have nutrients to function. If it can't get it from food, it will take the body apart and use what it has on hand. This is part of the reason so few "supermodels" make it into old age.