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ARFID often develops in childhood, whereas AN typically develops in adolescence or young adulthood. Understanding how age may impact differential psychological comorbidity profiles is important to inform etiological conceptualization, differential diagnosis, and treatment planning. We aimed to compare the lifetime frequency of psychiatric comorbidities and suicidality between females with ARFID (<jats:italic>n\u2009=<\/jats:italic>\u00a051) and AN (<jats:italic>n\u2009=<\/jats:italic>\u00a040), investigating the role of age as a covariate.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>We used structured interviews to assess the comparative frequency of psychiatric comorbidities\/suicidality.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>When age was omitted from analyses, females with ARFID had a lower frequency of depressive disorders and suicidality compared to AN. Adjusting for age, only suicidality differed between groups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>This is the first study to compare comorbidities in a similar number of individuals with ARFID and AN, and a structured clinical interview to confer ARFID and comorbidities, covarying for age, and the first to compare suicidality. Although suicidality is at least three times less common in ARFID than AN, observed differences in other psychiatric comorbidities may reflect ARFID's relatively younger age of presentation compared to AN.<\/jats:p><\/jats:sec><jats:sec><jats:title>Public Significance<\/jats:title><jats:p>Our results highlight that, with the exception of suicidality, which was three times less common in ARFID than AN irrespective of age, observed differences in psychiatric comorbidities in clinical practice may reflect ARFID's younger age at clinical presentation compared to AN.<\/jats:p><\/jats:sec>","DOI":"10.1002\/eat.23777","type":"journal-article","created":{"date-parts":[[2022,7,18]],"date-time":"2022-07-18T07:54:45Z","timestamp":1658130885000},"page":"1397-1403","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Differential comorbidity profiles in avoidant\/restrictive food intake disorder and anorexia nervosa: Does age play a role?"],"prefix":"10.1002","volume":"55","author":[{"given":"P. Evelyna","family":"Kambanis","sequence":"first","affiliation":[{"name":"Department of Psychology University of Wyoming  Laramie Wyoming USA"},{"name":"Eating Disorders Clinical and Research Program Massachusetts General Hospital  Boston Massachusetts USA"},{"name":"Department of Psychiatry Harvard Medical School  Boston Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephanie G.","family":"Harshman","sequence":"additional","affiliation":[{"name":"Eating Disorders Clinical and Research Program Massachusetts General Hospital  Boston Massachusetts USA"},{"name":"Neuroendocrine Unit, Department of Medicine Massachusetts General Hospital  Boston Massachusetts USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megan C.","family":"Kuhnle","sequence":"additional","affiliation":[{"name":"Eating Disorders Clinical and Research Program Massachusetts General Hospital  Boston Massachusetts USA"},{"name":"Neuroendocrine Unit, Department of 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