Anorexia nerovsa is a severe mental illness most often affecting adolescent girls. The etiology of the disorder is complex and involves genetics as well as environmental aspects. We have shown that epigenetic factors can contribute to the disorder. In the current Project, we have already measured epigenetic marks (i.e. DNA methylation) on a genome-wide level in girls participating in a psychotherapy-trial for anorexia nervosa. We want to compare our findings to the data from girls participating in the ALSPAC study that show no signs of an eating disorder.