Author presents the second (experimental) part of the paper focused on comorbidity of substance use disorders in eating disorders (ED). 55 inpatients with ED were included in the cross-sectional study. All patients were examined by Mini International Neuropsychiatric Interview (M.I.N.I.) and selected data from their history and psychiatric documentation were collected. 33 % of ED inpatients met the diagnostic criteria for any current substance dependence. The most frequent misused (substance abuse or dependence – SAD) substances were tobacco (36 % of inpatients), alcohol (16 %) and caffeine (11 %). SAD were linked to diagnostic subtype of the disorder (higher prevalence of SAD in bulimic than in anorectic forms), positive family history (5-times higher risk of SAD in patients with at least one family member with substance use problem). Age and number of hospitalisations were not linked to SAD in ED inpatients. We analyse possible causes and consequences of our findings later in discussion. Our data support other published work and call for further research in this field.

Key words: eating disorders – psychoactive substances – comorbidity – factors