Background: Recent literature has shown that up to one in every four early onset Eating Disorder presentations are male. Males account for 10–25% cases of Eating Disorders. Despite the relatively high prevalence of Eating Disorders in males, the research is limited. Our systematic review focuses on long-term physical health outcomes such as Body Mass Index (BMI)/weight and mortality in males who had undergone psychiatric inpatient admission for Anorexia Nervosa (AN) between the ages of 13 and 17 years. All outcomes were measured at least one year post-discharge. Methods: Articles published in peer reviewed journals between January 2012 and January 2023 in CENTRAL, MEDLINE, Embase and PsycINFO were searched. Following the screening of 1422 abstracts, 63 full text articles were retrieved and assessed for eligibility. Three articles were included in the review, of which, one was a Randomised Control Trial. An updated search completed in May 2025, did not find additional articles for inclusion. Results: In total, 31 males were included across the three studies. Three out of the thirty-one males died at follow-up and all three came from the same study. There was an overall improvement in BMI and BMI percentiles in males across all studies. Conclusions: Due to scarcity in literature focussing on adolescent male AN, it may be difficult to apply our findings within clinical contexts. Our review highlights the importance of addressing this gap in research and issues around providing generic treatments to young people with AN during admission without much consideration to gender differences. The PROSPERO Registration: The systematic review protocol was registered with the International Prospective Register of Systematic Reviews (PROSPERO) on 14 April 2023 (CRD42023407092, https://www.crd.york.ac.uk/PROSPERO/view/CRD42023407092).
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