The Barcelona Orthorexia Scale (BOS): development process using the Delphi method.

Purpose: Orthorexia nervosa is a currently investigated eating disorder proposed by US physician Steve Bratman, defined as pathological fixation on eating healthy food. This study aimed to develop, by consensus of experts, the basic items for a new questionnaire to evaluate some defining psychological features of orthorexia nervosa in English and Spanish language, the so-called Barcelona Orthorexia Scale (BOS).

Methods: The initial item pool was composed of 105 items divided into six different content areas.