orthorexiaor‧tho‧rex‧i‧a /ˌɔːθəˈreksiə $ ˌɔːr-/ (also orthorexia ner‧vo‧sa /-nɜːˈvəʊsə $ nɜːrˈvoʊ-/) noun [uncountable] 
an extreme desire to eat only food that you think is healthy, which may result in not eating enough food—orthorexic adjective
an extreme desire to eat only food that you think is healthy, which may result in not eating enough food—orthorexic adjective