what anorexia causes
Anorexia Nervosa-Cause. The cause of anorexia nervosa is not fully understood. It is thought to develop from a mix of physical, emotional, and social triggers. 1  Extreme dieting changes how the brain and metabolism work, and it stresses the body. 2  These changes may make you more likely to develop an eating disorder. 3  Genetics play a big part in anorexia and bulimia.