Most Helpful Girl
Its often because the desire to be thin is still popularised by the media and women often destroy their bodies to get to a size that their bodies weren't designed for. People never talk about the average body size and most people have no idea what size that even is.
I'm a curvy gal and there's nothing wrong with being tiny in my opinion. What I object to is girls with naturally small bodies desiring to be even thinner for truly cosmetic reasons. That isn't healthy. Plus size 0 varies in different countries. And height is also an important factor. If you're short then it's not too shocking to be slender, rather than the 5"9 women who look unwell at their height. All healthy bodies are good bodies.