<unk> , or<unk>  is a term coined by Dr. Steven Bratman, a Colorado MD, to denote an eating disorder characterized by a fixation on eating what the sufferer considers to be healthful food, which can ultimately lead to early death.
Bratman coined the term in 1997 from the Greek orthos, "correct or right", and orexis for "appetite". Literally "correct appetite", the word is modeled on anorexia, "without appetite". Bratman describes<unk>  as an unhealthy obsession (as in obsessive-compulsive disorder) with what the sufferer considers to be healthy eating. The subject may avoid certain foods, such as those containing fats, preservatives, or animal products, and suffer malnutrition.  Dr. Bratman asserts that "emaciation is common among followers of health food diets."
According to the Macmillan English Dictionary, the word is entering the English lexicon., though the condition is not listed in the DSM-IV. Bratman's concept has been criticized by some medical professionals, who state that focusing on healthful diet is generally considered beneficial and does not indicate a psychological pathology[citation needed].
However, the criticism is not universal in that<unk>  is used as a diagnosis by some practitioners who have documented the damaging results of the condition, as they have seen in their practices.
Orthorexia nervosa
Bulimia nervosa
Anorexia nervosa
Night eating syndrome
Diabulimia
Binge eating disorder
Exercise bulimia
Binge eating