Orthorexia has no universal menu. Food ideologies come in every variety imaginable, can conflict greatly with one another, and are all susceptible to orthorexia. In general, orthorexics tend to fixate on certain foods or ingredients as bad or impure. As more and more Americans embrace alternative eating practices, it can be difficult to draw a line between a sensitive eater and an orthorexic. According to Dr. Bratman, however, orthorexics display the three hallmarks of eating disorders : social isolation, cycling through emotional extremes, and obsession.