Despite the supposed positive effects for young women, many models have complained that this ban discriminates against those who are naturally thin. Sciutto agreed.
"I, being on the skinny side, find that people are taking it too far. Your body is your body. People should be happy if they have a full figure or a skinny figure or whatever," she said.
But McParland disagreed.
"I think there's a small subset of the population that has a body type that's naturally slender," she said. "But models or anyone that thin, is doing something -- whether or not it's a full-blown eating disorder, or drug use, which often goes hand in hand with an eating disorder."
But modeling, says Szish, "is one of those professions, like being a marathon runner, or a jockey, or a ballet dancer where you do need to have an extreme, somewhat unnatural, physique in order to be successful."
"Models don't sign up because they want to be examples," she said. "They're hired to be coathangers for designers ... props for the collection."
ABC's Julia Hoppock contributed to this report.