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Body mass index and risk of autoimmune diseases: a study within the Danish National Birth Cohort

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Maria C Harpsøe
  • Saima Basit
  • Mikael Andersson
  • Nete M Nielsen
  • Morten Frisch
  • Jan Wohlfahrt
  • Ellen A Nohr
  • Linneberg, Allan René
  • Tine Jess

BACKGROUND: A possible aetiological link between obesity and certain autoimmune diseases (ADs) has been suggested. We investigated the associations between body mass index (BMI, kg/m2) and 43 ADs.

METHODS: 75,008 women participating in the Danish National Birth Cohort were followed during a median time of 11 years. Diagnoses on ADs were retrieved from the Danish National Patient Register. Cox proportional hazard ratios (HRs) with 95% confidence intervals (CIs) were calculated adjusting for potential confounders (smoking, alcohol, parity and socio-occupational status).

RESULTS: During follow-up, 2430 women (3.2%) developed a total of 2607 new-onset ADs. Risk of any autoimmune disease was increased in obese women (HR, 1.27; 95% CI, 1.11 to 1.46) compared with normal weight women (18.5-≤25 kg/m2). Obese women (BMI≥30 kg/m2) were at increased risk of sarcoidosis (HR 3.59; 95% CI, 2.31 to 5.57) and type 1 diabetes mellitus (HR 2.67; 95% CI, 1.71 to 4.17). Risk of dermatitis herpetiformis increased by 14% (95% CI, 1% to 30%) per BMI unit. Conversely, risk of celiac disease and Raynaud's phenomenon decreased by 7% (95% CI, 1% to 13%) and 12% (95% CI, 4% to 19%) per BMI unit, respectively. Further associations between BMI and risk of psoriasis, rheumatoid arthritis and Crohn's disease were suggested.

CONCLUSIONS: BMI was found to be associated with several Ads. This was most pronounced between obesity and risk of sarcoidosis and and risk of type 1 diabetes mellitus. These novel findings need confirmation and the possible role of adipose tissue-derived immunological changes in the development of autoimmune reactions needs consideration.

OriginalsprogEngelsk
TidsskriftInternational Journal of Epidemiology
Vol/bind43
Udgave nummer3
Sider (fra-til)843-855
Antal sider13
ISSN0300-5771
DOI
StatusUdgivet - jun. 2014

ID: 137506133