I have found out that Anorexia is not caused mainly by the fashion industry.
I quote:
Believe it or not, anorexia isn’t really about food and weight—at least not at its core. Eating disorders are much more complicated than that. The food and weight-related issues are symptoms of something deeper: things like depression, loneliness, insecurity, pressure to be perfect or feeling out of control. Things that no amount of dieting or weight loss can cure.
When I say "pressure to be perfect", it does not mean pressure to look good. Rather, it's the pressure of being for example, a perfect daughter or son, or having parents that are overly controlling. Then, it is in fact caused by various social, emotional and biological factors.
People with anorexia are often perfectionists and overachievers. They’re the “good” daughters and sons who do what they’re told, excel in everything they do, and focus on pleasing others. But while they may appear to have it all together, inside they feel helpless, inadequate, and worthless. Through their harshly critical lens, if they’re not perfect, they’re a total failure.
Biological factor:
Research suggests that a genetic predisposition to anorexia may run in families. If a girl has a sibling with anorexia, she is 10 to 20 times more likely than the general population to develop anorexia herself. Brain chemistry also plays a significant role. People with anorexia tend to have high levels of cortisol, the brain hormone most related to stress, and decreased levels of serotonin and norepinephrine, which are associated with feelings of well-being.