Eating Disorders and Disordered Eating: What's the Difference, and How Dietetic Support Helps Recovery

Sophie Mumby, Registered Dietitian (HCPC)

Two people can both be struggling with food, weight and body image, and yet be dealing with quite different things clinically. One term I find myself explaining almost every week in clinic is the difference between an “eating disorder” and “disordered eating”. They're related, they can overlap, and one can develop into the other — but they're not the same thing, and understanding the distinction matters for getting the right support at the right time.

What we mean by an eating disorder

Eating disorders — anorexia nervosa, bulimia nervosa, binge eating disorder and related diagnoses — are recognised psychiatric conditions with very specific diagnostic criteria. They involve a persistent disturbance in eating behaviour, alongside thoughts and feelings about food, weight or body shape that are intense enough to significantly impair someone's physical health, psychological wellbeing or day-to-day functioning. A diagnosis made by a doctor requires a clinical assessment against specific criteria — things like the frequency of binge or purging episodes, the degree of weight suppression, or how central body shape has become to someone's sense of self-worth.

What we mean by disordered eating

Disordered eating is a broader, less clinically defined term. It describes a range of irregular eating behaviours such as chronic dieting that feels like it's not fully in control, rigid food rules, skipping meals, loss-of-control (binge) eating, anxiety or guilty feelings around food, that don't necessarily meet the threshold for a diagnosable eating disorder. But still affect someone's relationship with food and, often, their physical and mental health. It sits on a spectrum between a straightforwardly relaxed relationship with food at one end, and a diagnosable eating disorder at the other.

A UK general population study based in South London, using the SCOFF screening questionnaire, found that around 10% of adults reported patterns of disordered eating — much higher than the proportion who met full diagnostic criteria for an eating disorder. Furthermore, this study was conducted in 2014, and it is estimated that the number of people in the UK with eating difficulties has drastically increased since this time. In other words, disordered eating is common and can have a significant impact on someone's life, which is exactly why it deserves to be taken seriously rather than dismissed as “just dieting”.

What the latest research tells us

The evidence base in this field has grown considerably in recent years, and a few threads are particularly relevant to how I work with clients.

A 2025 paper found that dietitians hold a unique position to enable them to offer nutritional therapy at every stage of eating disorder recovery. This can be extended to those with disordered eating too as a dietitian's broad range of skills and training help support nutritional adequacy, support patient education and improve nutritional outcomes.

A recent randomised controlled trial published in the Journal of Eating Disorders examined a dietitian-led telehealth programme originally designed for difficulties around overeating, and specifically checked whether it caused any unintended harm to broader eating disorder symptoms. It found the opposite: the dietitian-led intervention produced positive improvements in several disordered eating behaviours, with no adverse effect on eating disorder pathology. It's a useful, contemporary example of two things I care about a great deal — that dietetic support can meaningfully improve disordered eating, and that this kind of work needs to be delivered thoughtfully enough to actively check it isn't doing harm.

How working with a dietitian supports recovery

Whether someone is dealing with a diagnosed eating disorder or a pattern of disordered eating that hasn't reached that threshold, dietetic support tends to add a few specific things to the wider picture of care:

• An accurate, individualised assessment of nutritional status, eating patterns and physical risk which is not solely based around body shape or weight.

• Structured, gradual work to rebuild regular eating and nutritional adequacy, at a pace that's realistic for the person in front of me.

• Practical help challenging food rules and rigid thinking about specific foods, which I understand can be tricky and take time to re-frame.

• Monitoring for medical complications — such as electrolyte disturbance, iron deficiency or bone health — that can arise from restrictive or irregular eating.

• Close coordination with therapists, GPs and psychiatrists, so nutritional and psychological work move in step rather than at cross purposes.

None of this replaces psychological therapy where that's needed — the strongest evidence in this field still points to psychological therapy as the primary treatment for most eating disorders. But nutrition is rarely just a technical afterthought to the psychological work; the research increasingly treats it as an active, evidence-based part of recovery in its own right, and that's very much how I approach it in practice.

A closing thought

If you recognise some of this in yourself — whether that's a fully diagnosable eating disorder or a pattern of eating that just doesn't feel right — please know that you don't need to wait until things feel “bad enough” to ask for support. Earlier, non-judgemental input tends to make the biggest difference, and that's exactly the kind of care I aim to offer.

This article is intended for general education and does not replace individual dietetic assessment, medical advice or mental-health care. If any of this resonates with you or someone you know, please reach out for personalised support.

References

NHS England, 2025. Adult psychiatric morbidity survey: Survey of mental health and wellbeing, England 2023/4 [Available at:] https://digital.nhs.uk/data-and-information/publications/statistical/adult-psychiatric-morbidity-survey/survey-of-mental-health-and-wellbeing-england-2023-24/eating-disorders. [Accessed on] 14.09.2026

Solmi, F., Hatch, S. L., Hotopf, M., Treasure, J., & Micali, N. (2014). Prevalence and correlates of disordered eating in a general population sample: the South East London Community Health (SELCoH) study (UK). Social Psychiatry and Psychiatric Epidemiology, 49, 1335–1346.

Solmi, F., Hatch, S. L., Hotopf, M., Treasure, J., & Micali, N. (2016). Eating disorders in a multi-ethnic inner-city UK sample: prevalence, comorbidity and service use. Social Psychiatry and Psychiatric Epidemiology, 51, 369–381.

Zhu, J., Hay, P. J., Yang, Y., Le Grange, D., Lacey, J. H., Lujic, S., Smith, C., & Touyz, S. (2023). Specific psychological therapies versus other therapies or no treatment for severe and enduring anorexia nervosa. Cochrane Database of Systematic Reviews, 8(8), CD011570.

Schmidt, U., Oldershaw, A., Jichi, F., Sternheim, L., Startup, H., McIntosh, V., et al. (2012). Out-patient psychological therapies for adults with anorexia nervosa: randomised controlled trial (UK). British Journal of Psychiatry, 201(5), 392–399.

Mathisen, T. F., Rosenvinge, J. H., Friborg, O., Vrabel, K. A., Bratland-Sanda, S., Pettersen, G., & Sundgot-Borgen, J. (2020). Is physical exercise and dietary therapy a feasible alternative to cognitive behavior therapy in treatment of eating disorders? A randomized controlled trial of two group therapies. International Journal of Eating Disorders, 53(4), 574–585.

Skinner, J. A., Leary, M., Whatnall, M., Hay, P. J., Paxton, S. J., Collins, C. E., & Burrows, T. L. (2025). 'Do no harm' — the impact of an intervention for addictive eating on disordered eating behaviours in Australian adults: secondary analysis of the TRACE randomised controlled trial. Journal of Eating Disorders, 13(1), 65.