Orthorexia refers to an unhealthy obsession with eating “pure” food. Food considered “pure” or “impure” can vary from person to person. This doesn’t mean that anyone who subscribes to a healthy eating plan or diet is suffering from orthorexia. As with other eating disorders, the eating behaviour involved – “healthy” or “clean” eating in this case – is used to cope with negative thoughts and feelings, or to feel in control. Someone using food in this way might feel extremely anxious or guilty if they eat food they feel is unhealthy.