Abstract

Diabetes and mental health disorders are two of the most prevalent chronic conditions globally, each exerting a 
substantial burden on individuals, health systems, and societies. Increasing evidence demonstrates a complex, 
bidirectional relationship between diabetes and mental health conditions, whereby diabetes heightens vulnerability 
to psychological distress, depression, anxiety, and other psychiatric disorders, while pre-existing mental health 
conditions increase the risk of developing diabetes and compromise disease management. This scholarly review 
synthesizes current evidence on the epidemiology, mechanisms, and outcomes of co-occurring diabetes and mental 
health conditions across the life course. It examines biological, psychological, and social pathways linking these 
conditions, including systemic inflammation, glycemic dysregulation, self-management burden, and socioeconomic 
determinants. The review further evaluates the impact of mental health on diabetes outcomes, highlighting 
challenges in glycemic control, treatment adherence, quality of life, and long-term complications. Existing 
interventions targeting comorbidity ranging from psychosocial therapies and lifestyle modification to integrated 
collaborative care models are critically assessed, with attention to special populations such as children and 
adolescents, older adults, pregnant individuals, and refugees. Methodological limitations in the literature and gaps 
in policy and health system responses, particularly in low- and middle-income countries, are discussed. The review 
underscores the urgent need for integrated, person-centered care models and calls for robust longitudinal research 
to inform policy, clinical practice, and equitable healthcare delivery for individuals living with diabetes and mental 
health conditions.