Polygenic risk score
Anorexia Nervosa
ICD-11 6B80 · Feeding and eating disorders
The Anorexia Nervosa polygenic risk score summarizes common-variant liability from the 2019 Watson PGC GWAS. Anorexia has an unusual genetic profile — overlap with both psychiatric and metabolic traits points to a neurometabolic architecture.
Anorexia Nervosa shows genetic correlations with both psychiatric traits (OCD rg ≈ 0.50) and metabolic traits (BMI, insulin resistance) — the only major psychiatric condition with a clear neurometabolic signature.
At a glance
Anorexia nervosa has emerging evidence of both psychiatric and metabolic genetic components. Your score reflects the 2019 PGC anorexia GWAS.
Anorexia nervosa is a serious eating disorder characterized by restricted food intake, intense fear of weight gain, and body image disturbance. Twin heritability is around 50-60%. The 2019 PGC-AN GWAS notably found that anorexia genetics correlate with both psychiatric traits (OCD, schizophrenia, anxiety) AND metabolic traits — suggesting it sits at an unusual intersection of psychiatric and metabolic biology.
What the GWAS actually found
The Watson et al. 2019 PGC GWAS (Nature Genetics) combined 16,992 anorexia cases and 55,525 controls, identifying 8 genome-wide significant loci. SNP-based heritability was estimated at approximately 11% on the liability scale.
A distinctive feature of anorexia genetics is its dual-axis overlap: substantial common-variant correlation with OCD (rg ≈ 0.50), anxiety, and depression on the psychiatric axis; and significant correlation with BMI, insulin resistance, and lipid traits on the metabolic axis. This has reframed anorexia as a neurometabolic condition rather than a purely psychiatric one.
How to read your percentile
Below 25th
Lower common-variant liability than most of the reference cohort. Anorexia prevalence remains low (~0.9% lifetime) regardless of PRS.
25th–75th
Typical range — near the population average. PRS is not clinically actionable at this percentile.
Above 75th
Elevated common-variant liability. Interpret alongside eating-behavior history, anxiety profile, and family psychiatric history. Early intervention improves anorexia prognosis substantially.
What this does not tell you
An anorexia PRS cannot diagnose anorexia, predict age of onset, or identify which individuals with eating-disorder risk factors will develop anorexia versus bulimia, binge-eating disorder, or subthreshold presentations. The GWAS focused on restrictive-subtype anorexia; binge-purge and atypical presentations may have partially distinct architecture.
Eating-disorder treatment — family-based therapy for adolescents, cognitive-behavioral therapy, nutritional rehabilitation — is clinical and evidence-based, not genetically prescribed. The score cannot predict treatment response. Cross-ancestry transportability is reduced in non-European cohorts.
Related traits
Anorexia Nervosa shares common-variant architecture with several other psychiatric conditions. Genetic correlations (rg) reflect how often the same variants move risk for both traits in the same direction.
Frequently asked questions
Is anorexia 'genetic'?
Anorexia has twin-study heritability of roughly 50–60% and SNP-based heritability of ~11%. The common-variant architecture overlaps with both psychiatric conditions (OCD, anxiety) and metabolic traits (BMI, lipids), supporting a neurometabolic conceptualization.
Does this score predict bulimia or binge-eating disorder?
Not directly. The Watson 2019 GWAS focused on restrictive-type anorexia. Bulimia and binge-eating disorder GWAS are emerging but smaller. Cross-disorder architecture within eating disorders is an active research area.
What does the metabolic genetic overlap mean practically?
The overlap suggests anorexia is not purely a psychiatric condition driven by body-image ideation — metabolic predisposition contributes. This has implications for refeeding physiology and treatment resistance, though direct clinical applications are still being developed.
Should I be worried if my anorexia PRS is elevated?
No. PRS is a population-level probabilistic signal. Anorexia diagnosis requires clinical evaluation based on weight, eating behavior, body-image cognitions, and functional impairment — not genetics.
Sources
- Watson et al. 2019, Nature Genetics 51:1207–1214. doi.org/10.1038/s41588-019-0439-2
- PGC Eating Disorders Working Group. pgc.unc.edu/for-researchers/working-groups/eating-disorders-workgroup/
- Yilmaz et al. 2018 — OCD & Anorexia rg. doi.org/10.1038/s41380-018-0115-4
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