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Orthorexia (sometimes called orthorexia nervosa) is a pattern of disordered eating characterised by an excessive and rigid focus on eating only foods that the person considers to be “healthy,” “clean,” or “pure.” While an interest in healthy eating is generally positive, orthorexia describes a point where the pursuit of dietary purity becomes all-consuming, distressing, and harmful to physical and mental health.
Orthorexia is not yet a standalone diagnosis in the DSM-5, but it is increasingly recognised by clinicians and researchers as a significant form of disordered eating. Depending on how it presents, it may be diagnosed under OSFED or as part of another eating disorder. Regardless of the formal label, the distress and harm it causes are real and treatable.
Healthy eating involves making balanced food choices most of the time while maintaining flexibility and enjoyment. Orthorexia differs in that the rules around food become rigid, inflexible, and a source of significant anxiety. A person with orthorexia may experience intense guilt or distress when they eat something outside their rules, even if they know the food is nutritionally adequate. The focus shifts from nourishment to control, and food choices begin to shrink rather than expand.
Another important distinction is impact on quality of life. When food rules start to affect relationships, social participation, physical health, or emotional wellbeing, the pattern has moved beyond healthy eating into disordered territory.

When food rules become too restrictive, orthorexia can lead to the same physical consequences as other restrictive eating disorders. Malnutrition, significant weight loss, fatigue, hormonal disruption, bone density loss, and weakened immune function are all potential outcomes. The physical effects can be similar to those seen in anorexia nervosa, even if the person’s underlying motivation is different.
The impact on mental health and relationships can be equally significant. Rigid food rules can cause ongoing anxiety, social isolation, and conflict with family and friends. People with orthorexia may find it impossible to eat meals prepared by others, attend social events, or travel, all of which restrict their quality of life.