Recently, there is an increasing interest in the link between anorexia nervosa and autoimmune diseases. Studies show significant association between anorexia nervosa, diabetes mellitus, autoimmune thyroid disease and Crohn's disease [1]. The findings of significantly elevated autoantibodies (anti α-MSH, anti ACTH) and cytokines (IL-1, IL-6, IFN-γ, TNF-α) support this relationship.

To illustrate with a clinical case the connection between eating disorders and Crohn's disease.

Fourteen years-old boy with moderate depression syndrome after his grandfather's decease. Since overweight diagnosis by his pediatrician, he begins to restrict food intake with an important weight loss (19 kg in 9 months) and over exercising. Blood test reveals microcytic and hypochromic anaemia, rest of the examination shows no other disorder. Psychometric assessment EDI-3 suggests Anorexia Nervosa restricting type.

Two months after clinical stabilization, he is hospitalized due to abdominal pain. Exploration including blood test, serology, coproculture, sonography and colonoscopy reveals severe Crohn's disease.

This case is about a patient diagnosed of moderate depressive syndrome, who develops anorexia nervosa and Crohn's disease during his follow up. It exemplifies the link between stress, immunity and eating disorders. Recent findings suggest that immune diseases are involved in onset and maintenance of eating disorders. More studies are required in order to inference its consequences in evaluation, prognostic, treatment and identification of subgroups of patients.

The authors have not supplied their declaration of competing interest.