Clinical Takeaway
The REAL 2.0 cohort study tracked Canadian youth over 15 years to examine how adolescent risk factors like body image concerns and disordered eating contribute to mental health and substance use outcomes in early adulthood. Findings from this research confirm that psychosocial vulnerabilities established in early adolescence have measurable, lasting effects on multiple health domains into adulthood. Clinicians should recognize adolescence as a critical window for identifying and addressing these interconnected risk factors before they solidify into chronic conditions.
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 study provides critical evidence on how adolescent risk factors like body image disturbance and disordered eating predict eating disorders, weight-related pathology, and comorbid mental health and substance use outcomes in Canadian adults. Understanding these developmental trajectories is essential for identifying high-risk adolescents who may benefit from early intervention and for informing prevention strategies that address the multimorbid nature of eating and psychiatric disorders in young adulthood. The extended follow-up period and focus on protective factors offers clinicians actionable insights for risk stratification and timing of preventive care 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 this Canadian cohort study offers valuable longitudinal data on how adolescent eating behaviors and body image predict adult mental health and substance use outcomes, the relevance to cannabis medicine specifically remains unclear from the available abstract, which appears truncated. The study’s strength lies in its extended follow-up period and examination of multimorbid conditions, yet clinicians should note that any cannabis-related findings would likely be secondary outcomes, potentially subject to confounding by concurrent mental health conditions, socioeconomic factors, and unmeasured lifestyle variables that also track from adolescence to adulthood. The generalizability to non-Canadian populations and the possibility of selection bias in a 15-year longitudinal study warrant caution in applying results. For cannabis-prescribing clinicians, this research underscores the importance of screening adolescent and young adult patients for underlying eating disorders and body image disturbance as independent risk factors for psychiatric comorbidity, rather than assuming cannabis use alone explains mental health trajectories in this population.
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