In a 1997 article in the magazine "Yoga Journal", the American physician Steven Bratman coined the term "orthorexia nervosa" from the Greek ορθο- ("ortho", "right" or "correct"), and όρεξις ("orexis", "appetite"), literally meaning 'correct appetite', but in practice meaning 'correct diet'. The term is modeled on "anorexia", literally meaning "without appetite", as used in the definition of the condition anorexia nervosa. (In both terms, "nervosa" indicates an unhealthy psychological state.) Bratman described orthorexia as an unhealthy fixation with what the individual considers to be healthy eating. Beliefs about what constitutes healthy eating commonly originate in one or another dietary theory such as raw foods veganism or macrobiotics, but are then taken to extremes, leading to disordered eating patterns and psychological and/or physical impairment. Bratman based this proposed condition on his personal experiences in the 1970s, as well as behaviors he observed among his patients in the 1990s. In 2000, Bratman, with David Knight, authored the book "Health Food Junkies", which further expanded on the subject.