article · Diabetes Obesity and Metabolism
Depression and type 2 diabetes share a bidirectional relationship, with their coexistence occurring twice as frequently as either disorder on its own. Type 2 diabetes can increase the risk of depression through hyperglycaemia, dyslipidaemia, and dysregulated insulin signalling. These metabolic disturbances elevate inflammation, induce oxidative stress, and impair brain serotonin signalling. Conversely, depression and psychological stress can drive the onset of type 2 diabetes and worsen glycaemic control. Chronic stress associated with depression disrupts the hypothalamic-pituitary-adrenal axis, increasing circulating cortisol levels and triggering insulin resistance. Ultimately, the shared pathological processes involve reciprocal interactions where metabolic dysfunction impairs brain neurotransmission, while neuroendocrine stress responses exacerbate metabolic failure.
Understanding the biological links between mental health and metabolic conditions is critical for integrated patient care. Because depression and type 2 diabetes actively reinforce each other through inflammation, brain chemistry disruptions, and stress hormones, treating one condition requires managing the other. Recognising these shared mechanisms can assist healthcare providers in addressing both psychological and physical health concurrently.
The abstract outlines early-stage mechanistic insights from a narrative review regarding pathways connecting metabolic and mental disorders. While understanding these targets could eventually inform dual-action therapies or integrated clinical management strategies, the research is purely mechanistic and distant from commercial use. The abstract does not indicate an application pathway.
AI-generated from the published abstract. Always read the original work before citing.
Depression is a mood disorder that may increase risk for the development of insulin resistance (IR) and type 2 diabetes (T2D), and vice versa. However, the mechanistic pathway linking depression and T2D is not fully elucidated. The aim of this narrative review, therefore, was to discuss the possible link between depression and T2D. The coexistence of T2D and depression is twice as great compared to the occurrence of either condition independently. Hyperglycaemia and dyslipidaemia promote the incidence of depression by enhancing inflammation and reducing brain serotonin (5-hydroxytryptamine [5HT]). Dysregulation of insulin signalling in T2D impairs brain 5HT signalling, leading to the development of depression. Furthermore, depression is associated with the development of hyperglycaemia and poor glycaemic control. Psychological stress and depression promote the development of T2D. In conclusion, T2D could be a potential risk factor for the development of depression through the induction of inflammatory reactions and oxidative stress that affect brain neurotransmission. In addition, chronic stress in depression may induce the development of T2D through dysregulation of the hypothalamic-pituitary-adrenal axis and increase circulating cortisol levels, which triggers IR and T2D.
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DOI: 10.1111/dom.15630
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