They are considered real diseases. This is an addictive behavior that patients cannot control on their own. Such diseases are united by a group of mental disorders called addictions. Addictions also include alcoholism and drug addiction.
Of course. These are real-life mental disorders. In his right mind, a person will not deplete his body, leading him to death, or watch his hair and teeth fall out, and continue to puke.
I went through this myself and more than once heard that these things are nonsense and "I just had to eat right and not do bullshit"
Anorexia / bulimia - addiction to hunger / food and the obsession that a person must either be thin or die, so yes, this is considered diseases.
Of course! Anorexia nervosa and Bulimia nervosa are classified as psychiatric eating disorders and are classified as mental illnesses according to the ICD-10 international disease classification.