^ I completely agree, Urban.
Depression doesn't discriminate, it can affect anyone regardless of the world and occupation they're in. Although I think specific occupations that demand and drain you so much emotionally and creatively might be a bigger burden for extremely sensitive people.
In the case of models, I definitely agree the circumstances probably contribute a little more, not just for the blatant rejection and the loneliness the job involves but also, these are people that are only coming of age and suddenly not just facing the complexities of their career but the difficulties of becoming an adult, too... most of my friends have in some way or another experienced the Quarter Life Crisis.. the feeling that you suddenly became an adult and have achieved around 1% of what you expected to have done by that age, probably based on silly childhood dreams but still, there's a sense of failure that eventually goes away but when it hits you the moment you reach your 20s, it's very very hard, it doesn't matter if you're about to graduate from University and have a perfectly fine life, there's still the sense that you messed it up in some way.. so, I can only imagine how a model, that lives against the clock, trying to keep up with extreme physical and mental demands, working in an industry that they probably weren't dreaming of or vocationally apt for, having chosen a life that ended up being more lonely and cruel than they probably thought, seeing their friends going off to college and carrying on with simple but perhaps more satisfactory lives, and on top of it all, seeing their modeling careers either on decline or just not achieving what other (perhaps younger) models have, it's not that hard to imagine some of them must wonder if modeling and being judged for it is what it all came down to when maybe they projected a completely different life for them, and if what they do now is irreversible and probably just a massive mistake... all questions that have easy answers and easier remedies but finding the answer in the wrong door instead of opting for a healthier change of landscape probably speaks more for the vulnerable state they're in and how far away they are from turning to their family and genuine friendships during very cloudy moments.