Volume 60, Issue 7 p. 803-812
Original Article

Bidirectional relationship between eating disorders and autoimmune diseases

Anna Hedman

Anna Hedman

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

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Lauren Breithaupt

Lauren Breithaupt

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Department of Psychology, George Mason University, Fairfax, VA, USA

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Christopher Hübel

Christopher Hübel

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Social, Genetic & Developmental Psychiatry Centre, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK

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Laura M. Thornton

Laura M. Thornton

Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA

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Annika Tillander

Annika Tillander

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Department of Computer and Information Science, Linköping University, Linköping, Sweden

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Claes Norring

Claes Norring

Department of Clinical Neuroscience, Centre for Psychiatry Research, Karolinska Institutet, & Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden

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Andreas Birgegård

Andreas Birgegård

Department of Clinical Neuroscience, Centre for Psychiatry Research, Karolinska Institutet, & Stockholm Health Care Services, Stockholm County Council, Stockholm, Sweden

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Henrik Larsson

Henrik Larsson

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

School of Medical Sciences, Örebro University, Örebro, Sweden

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Jonas F. Ludvigsson

Jonas F. Ludvigsson

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Department of Pediatrics, Örebro University Hospital, Örebro, Sweden

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Lars Sävendahl

Lars Sävendahl

Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden

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Catarina Almqvist

Catarina Almqvist

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Pediatric Allergy and Pulmonology Unit, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden

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Cynthia M. Bulik

Corresponding Author

Cynthia M. Bulik

Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden

Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA

Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA

Correspondence

Cynthia M. Bulik, Department of Psychiatry, University of North Carolina at Chapel Hill, CB #7160, 101 Manning Drive, Chapel Hill, NC 27599-7160, USA; Email: [email protected]

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First published: 03 September 2018
Citations: 67
Conflict of interest statement: See Acknowledgments for full disclosures.

Abstract

Background

Immune system dysfunction may be associated with eating disorders (ED) and could have implications for detection, risk assessment, and treatment of both autoimmune diseases and EDs. However, questions regarding the nature of the relationship between these two disease entities remain. We evaluated the strength of associations for the bidirectional relationships between EDs and autoimmune diseases.

Methods

In this nationwide population-based study, Swedish registers were linked to establish a cohort of more than 2.5 million individuals born in Sweden between January 1, 1979 and December 31, 2005 and followed up until December 2013. Cox proportional hazard regression models were used to investigate: (a) subsequent risk of EDs in individuals with autoimmune diseases; and (b) subsequent risk of autoimmune diseases in individuals with EDs.

Results

We observed a strong, bidirectional relationship between the two illness classes indicating that diagnosis in one illness class increased the risk of the other. In women, the diagnoses of autoimmune disease increased subsequent hazards of anorexia nervosa (AN), bulimia nervosa (BN), and other eating disorders (OED). Similarly, AN, BN, and OED increased subsequent hazards of autoimmune diseases.Gastrointestinal-related autoimmune diseases such as, celiac disease and Crohn's disease showed a bidirectional relationship with AN and OED. Psoriasis showed a bidirectional relationship with OED. The previous occurence of type 1 diabetes increased the risk for AN, BN, and OED. In men, we did not observe a bidirectional pattern, but prior autoimmune arthritis increased the risk for OED.

Conclusions

The interactions between EDs and autoimmune diseases support the previously reported associations. The bidirectional risk pattern observed in women suggests either a shared mechanism or a third mediating variable contributing to the association of these illnesses.