Early Onset Anorexia Nervosa in Children Aged 8 to 12 Years: a Retrospective Study

Early onset anorexia nervosa accounts for 8% of anorexia cases worldwide. Very few studies on this subject exist, given the difficulty of obtaining a sufficiently significant sample. The aim of this study was to supplement the literature and investigate the clinical characteristics of early onset anorexia nervosa.

This is a monocentric retrospective study carried out on the records of patients aged 8 to 12 years with early onset anorexia nervosa, hospitalized in the child psychiatry unit at the Queen Fabiola University Children's Hospital, in Brussels, from 01/01/2000 to 01/07/2023. Descriptive statistics were then performed on the sample and compared with the data found in the literature.

This study included 48 children aged 8 to 12 with early onset anorexia nervosa. In the sample, three children were diagnosed with autism spectrum disorder during hospitalization. The sample included 36 girls and 12 boys, with an average age of 11 years and 7 months. The patients had an average body mass index of 13.6 kg/m² on admission. A total of 87% of the parents had a history of psychiatric illness. A large majority of the children had underlying depressive and anxiety disorders. The duration of anorexia nervosa in these children was 13.5 months from diagnosis, with an average hospital stay of 5.4 months.

This study seems to show the difficulty for parents and caregivers in diagnosing this illness and the probable impact of genetics and maternal depression on the development of early onset anorexia nervosa.