We heard that the condition is far more readily diagnosed in girls than boys, and indeed that a girl will often be picked up and then her brothers turn out to have the same problem when investigated. Why? Because if a teenaged boy suddenly loses all the fat from his limbs, the uncovered muscles give the appearance of being "cut", and prominent muscles are desirable for teenaged boys. But if a similar process happens to a girl, she panics because her arms and legs are becoming all ugly and muscly, and rushes to the doctor.
The (American) lecturer regarded this as vaguely amusing. But I find it really rather sad, the idea that having visible muscles is such a terrible tragedy for girls. (OK, in this case it is the symptom of a serious disease, but in the early stages there's no reason to think that.) It makes me wonder just how many girls are avoiding doing exercise to make sure their limbs stay soft and unmuscular.