A shift or a substitution? On naming, exclusion, and co-production in longstanding eating disorders: matters arising from Lubieniecki et al. (2025).

This Matters Arising piece responds to the article by Lubieniecki et al. (2025), which explores lived experience perspectives on the 'SEED' (Severe and Enduring Eating Disorder) classification. Written from the standpoint of someone with lived experience of a longstanding eating disorder and professional involvement in research, policy, and service development, the piece supports Lubieniecki et al.'s analysis of 'SEED' as both validating and restrictive. It extends their work by situating the classification within a broader landscape of psychiatric labelling associated with treatment exclusion. The limitations of replacing 'SEED' with alternative terminology alone are considered, with emphasis on the need for corresponding reforms to care pathways and their provision. The author highlights how diagnostic language can serve not only descriptive but also administrative and prognostic functions, often reflecting institutional constraints rather than individual need. The importance of co-produced approaches to diagnostic frameworks is also discussed, with emphasis on embedding lived experience throughout classificationand service design.