Eating disorders are difficult to treat. Some forms of treatment have already been found to be effective, nevertheless chronicity is a major problem. For example, both cognitive behavioral therapy and family therapy (FBT; family-based treatment) appear to be effective treatment methods, in which FBT distinguishes itself primarily in its long-term effect. However, eating disorders persist in 20 to 25 percent of cases, only 46 percent of patients with Anorexia Nervosa fully recover and one third only partially improve. Since the mortality rate of this mental disorder is particularly high, it is necessary to keep looking to improve treatment. Because emotion regulation problems play an important role in the cause and maintenance of an eating disorder, more emotion-focused therapies may improve treatment outcome. Dialectical Behavioral Therapy is a treatment that has a strong focus on emotions regulation, but so far only limited evidence has been found for the effectiveness of this type of therapy in eating disorders. Some studies show that art therapy (AT; art therapy) can contribute to a more adaptive regulation of emotions. However, this type of therapy has not been studied in the context of eating disorders yet. AT is an experiential form of therapy in which art techniques and supplies (including drawing, painting, clay, etc.) are used methodically with a therapeutic purpose. The idea that creative expression can perpetuate or improve mental well-being has been accepted worldwide for many years. Despite the long history of practical applications, to date little evidence exist on the effectiveness of this form of treatment. There's growing worldwide interest in scientific research and the emphasis on evidence-based practice (EBP) for this form of treatment. In a recent study, Lock and colleagues compare AT with cognitive remediation therapy (CRT) and the added value of both in a sample of adolescents with anorexia nervosa combines with obsessive-compulsive problems. Both CRT and AT are offered in this study in combination with family based therapy (FBT). The group in which the combination of FBT and AT was offered yielded better results than those in which FBT is combined with CRT.

Study hypothesis: the investigators expect that complementing treatment as usual (TAU) with art therapy (AT) will lead to a decrease in emotion regulation problems in patients with an eating disorder in comparison with TAU only, without AT.

Inclusion Criteria:

• The participant is diagnosed with an eating disorder by a psychiatrist at the outpatient department of Ghent University Hospital Eating Disorders.
• At the start of the study, the participant is being treated by a psychiatrist or psychologist at the outpatient department of Eating Disorders at UZ Gent.
• The participant is informed about the purpose of the research and informed consent.

Exclusion Criteria:

• The candidate has already had a hospitalization and so art therapy at the eating disorders department at UZ Gent.
• Lower intelligence with an estimated IQ score lower than 85- The candidate participant is a minor at the start of the study.
• The candidate is struggling with a psychotic problem, as determined by the treating physician or psychologist.