Clinical Takeaway
The REAL 2.0 cohort study tracked Canadian youth over 15 years to understand how adolescent risk factors like body image concerns and disordered eating contribute to eating disorders, mental health conditions, and substance use problems in early adulthood. The findings reinforce that disordered eating and poor body image in adolescence are not isolated concerns but early markers of broader multimorbid health trajectories. Clinicians should screen for these factors early, as they may predict a range of interconnected health outcomes well into adulthood.
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 15-year longitudinal cohort study provides critical evidence on how adolescent psychosocial factors including body image and disordered eating predict multimorbid mental health and substance use outcomes in early adulthood, addressing a significant gap in prospective data for Canadian populations. Understanding these developmental trajectories enables clinicians to identify high-risk adolescents who require early intervention and to tailor prevention strategies targeting the specific comorbidities most likely to emerge in their patient populations. The study’s extended follow-up period strengthens causal inference regarding etiological pathways and establishes a foundation for evidence-based, developmentally informed clinical protocols across eating disorder, mental health, and addiction medicine specialties.
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 cohort provides valuable longitudinal data on how adolescent psychosocial factors predict adult mental health and substance use outcomes in a Canadian population, the study design does not appear specifically powered to examine cannabis use patterns or cannabis-related health effects. The relationship between disordered eating, body image disturbance, and cannabis use in this cohort likely reflects shared underlying vulnerabilities such as anxiety, depression, or impulsivity rather than direct causal pathways, and we lack information about cannabis frequency, potency, product type, or clinical indication that would be necessary for meaningful clinical assessment. Importantly, any observed associations between adolescent eating or mental health concerns and adult cannabis use may be confounded by concurrent substance use patterns, socioeconomic factors, or changes in cannabis legalization and availability over the study period. For clinicians caring for adults with eating disorder histories or ongoing body image concerns, this study reinforces the value of comprehensive substance use screening as part of mental health assessment, but does not provide direct
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