Clinical Takeaway
Over a 15-year period, this Canadian cohort study tracked adolescents into early adulthood to understand how early risk factors like body image concerns and disordered eating contribute to mental health and substance use outcomes over time. The findings highlight that psychosocial vulnerabilities identified in adolescence, including disordered eating patterns, are meaningfully linked to a range of health problems in adulthood. Clinicians should recognize that early screening for body image distress and disordered eating in adolescent patients may help identify those at elevated risk for later mental health and substance use challenges.
#6 Research on Eating and Adolescent Lifestyle (REAL) 2.0: 15-year follow-up study of eating disorders and weight-related trajectories, mental health and substance use health from early adolescence to early adulthood-a Canadian cohort profile.
Citation: Obeid Nicole et al.. Research on Eating and Adolescent Lifestyle (REAL) 2.0: 15-year follow-up study of eating disorders and weight-related trajectories, mental health and substance use health from early adolescence to early adulthood-a Canadian cohort profile.. BMJ open. 2026. PMID: 41526025.
Design: 0 Journal: 3 N: 4 Recency: 3 Pop: 3 Human: 1 Risk: -2
This longitudinal cohort study provides critical evidence on how adolescent eating behaviors and body image concerns predict adult mental health outcomes and comorbid conditions, enabling clinicians to identify high-risk youth who may benefit from early intervention. The 15-year Canadian follow-up data addresses a significant knowledge gap regarding the trajectory from disordered eating in adolescence to multimorbid psychiatric and substance use disorders in adulthood, informing prevention and treatment strategies tailored to this vulnerable population.
Quality Gate Alerts:
- Preclinical only
Methodological Considerations:
- Cross-sectional design — causal inference not possible
Abstract: PURPOSE: Few studies have examined how psychosocial risk and protective factors in adolescence shape mental health outcomes and other multimorbid conditions in adulthood, particularly among Canadian youth. The Research on Eating and Adolescent Lifestyle (REAL) 2.0 study was a 15-year follow-up cohort study designed to investigate how early etiological factors, including body image and disordered eating symptoms in adolescence, contribute to the development of eating, weight-related concerns, mental health and substance use health problems in early adulthood. In this paper, we describe the REAL 2.0 cohort’s demographic and clinical characteristics alongside an overview of the study procedures, laying the groundwork for collaboration on future learnings with this unique data. PARTICIPANTS: The cross-sectional REAL study initially surveyed middle and high school students from 2004 to 2010 (n=3043) across 43 schools in the Ottawa, Canada region. Of those, respondents in grade 7 or 9 (n=1197 from 25 of the 43 original schools) were asked to participate in a longitudinal arm of the study that consisted of yearly follow-ups. From the longitudinal cohort, there were 278 participants (29.1% male; Mage=28.6) from those who consented to be re-contacted (n=912), who completed the REAL 2.0 survey electronically (30.4%), providing comprehensive data on demographic, clinical, eating and weight-related behaviour, psychological, social, environmental and substance use health factors in adulthood. FINDINGS TO DATE: 9.4% of REAL 2.0 participants met DSM-5 criteria for an eating disorder, while 17.6% met criteria for disordered eating. Moderate to severe anxiety was reported by 28% of participants, while 21.6% experienced moderate to severe depressive symptoms. Regarding substance use, 16.9% engaged in hazardous drinking, 16.9% used cannabis daily or almost daily, and 4.3% reported daily tobacco use. FUTURE PLANS: REAL 2.0 has the potential to answer multiple research questions about s
🧠 While the REAL 2.0 study provides valuable longitudinal data on how adolescent eating behaviors and body image predict adult mental health and substance use outcomes in a Canadian population, clinicians should note that cannabis use patterns are likely documented as one outcome among many rather than as a primary intervention or treatment variable. The study’s 15-year follow-up design allows us to understand correlations between early psychosocial risk factors and later cannabis use, but we cannot infer causation or treatment efficacy from this observational cohort work. Important confounders such as concurrent psychiatric comorbidities, socioeconomic factors, and the timeline of cannabis initiation relative to eating disorder onset and remission remain difficult to disentangle in longitudinal epidemiologic research. Clinically, this research reinforces that adolescents presenting with disordered eating or body image concerns warrant thorough substance use screening in follow-up care, as these populations may show higher rates of cannabis use in early adulthood, though cannabis itself should not