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Causes of Orthorexia nervosa
Although the genetic causes of orthorexia are unclear, the social and mental processes that cause someone to develop it have been explored. orthorexia nervosa is caused by an obsession with "pure" eating to the point where it interferes with a person's lifestyle. It often begins with an attempt to follow a more "healthy" diet, but evolves into an obsession with limiting food choices and pursuing "healthy" eating to an unhealthy degree, leading to malnutrition.

Orthorexia and other disorders
"Unlike anorexia and bulimia, which are obsessions about the quantity of food intake (and also physical appearance), orthorexia nervosa results from an obsession about the quality of food intake," and it is fueled by a feeling of achieving perfection and purity by only consuming "healthy" foods.

Orthorexic behaviors can often lead to malnutrition and weight loss, and it is often associated with anorexia nervosa. Studies have also shown that obsessive-compulsive tendencies are linked to the development of orthorexia, and some researchers suggest that orthorexia should be diagnosed as OCD because it is driven by an obsession for attaining a perfect diet.

Orthorexia nervosa bibliography

 * https://centerfordiscovery.com/blog/more-orthorexia-nervosa-warning-signs/
 * https://www.nationaleatingdisorders.org/learn/by-eating-disorder/other/orthorexia
 * https://jeatdisord.biomedcentral.com/articles/10.1186/s40337-020-00331-2